THEA RENDER ADAPTIVE BSD ENGINE
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1. At the left images you can see the results with Field Mapping enabled at first and then with the rest of settings being identical with Field Mapping disabled We would need to use much higher settings if we wanted to render this scene without Field Mapping that would increase render times a lot The only light sources used in this scene are the sun and the sky ETT n The clouds artifact can be solved by increasing Density Boost or by enabling Adaptive Density Try to increase Density Boost by 50 or 100 units until the clouds disappear E F 4 F ae gt This kind of artifact can occur if the Cell Size When edges and small details start to lose The fine shadows on the TV model are Here we can see blotches with the is too low Keep the Cell Size above 100 with definition and look dirty we need to showing some issues This kind of artifact is characteristic mixture of small and big bright the correct relation to the Field Density Safe reduce the Min Distance px A value typically caused by a very low Prepass Level spots This is clearly a signal that there are values are between 200 and 300 between 1 000 and 4 000 should solve this value Keep the Prepass Level above 2 1 not enough Final Gathering samples Figure 18 Interior scene with sun and sky light rendered with the use of Field Mapping technique 13 Copyright Solid Iris Technologies D HEA RENDER Inc2. ial Ho p lt rh a fo a p m m THEA RENDER SOLIDIRIS TECHNOLOGIES ADAPTIVE BSD ENGINE ADAPTIVE BSD ENGINE Adaptive BSD is the name of the biased engine inside Thea Render This engine is a biased one this is why we use the abbreviation BSD as it uses interpolation schemes like irradiance cache to render in shorter times find out here more details This engine in comparison with the progressive engines needs more tuning for bringing the best results in less time and at this tutorial we will explain how each parameter affects the final output Please note that after the release of 1 2 Presto Edition of Thea the Adaptive BSD engine has been refined by the addition of Field mapping technique which can give great and fast results in real scenes situations This robust engine offers the possibility to have ready to use presets shadow catcher and bump map improvements and _ flicker free walkthrough animations As we see in Figure 1 we have three tabs for tuning the Adaptive BSD engine the General the Biased RT Ray Tracing and the Biased GI Global Illumination tabs At the next tables we describe analytically these tabs and the way their parameters work for giving the best final results After this description we can see some case studies renders showing the way Field Mapping works some common artifacts and the settings we need to change to remove them and other useful tips Note that the bes
3. value max distance has less impact on final render times except if a very low value is being used This value is also render resolution dependent for very high resolution values a value higher than 40 000 can be used Tip the max distance px value should be always higher than the min distance px value Prepass Level the prepass level can be seen as a diffuse Mig Irradiance Cache antialiasing setting for the irradiance cache The values EGJ available here go from very coarse 1 8 to very fine 8 1 RAGA E Hiio manual input values like 6 1 are possible too Min Distance px A default value like 2 1 is a good starting point The Disiiembelinmm ns prepass level will help when we get discontinuous Mie s sieaie samplings on fine details in our scenes showing up like missing samples or discontinuous lines or very tiny blotches Increasing this value will fix such situations Increasing this value has a moderate impact on render times J L aL be E gt Density Boost 4 Adaptive Density Max Contrast 5 Force Interpolation 1 1 Prepass Only Visualize Figure 16 Prepass Level values 10 Copyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES Density Boost density boost will add additional samples to the given Sample Density There is a special artifact that can show up when there are not enough samples which is called clouds Clouds are artifacts that look like uneven s
4. 000 should solve this issue Figure 19 Interior scene with 2 lights rendered with the use of Field Mapping technique 14 Copyright Solid Iris Technologies TECHNOLOGIES CD THEA RENDER SOLIDIRIS TECHNOLOGIES This scene shows a problem caused by Tracing Depth The glass material has a high tracing depth assigned at the General Panel of Material Lab but it renders black on some parts because of a too low tracing depth at the Adaptive BSD RT panel What is happening here is that Thea GI computation takes the tracing depth value from the Adaptive BSD RT panel and when this value is too low it can not calculate the GI solution behind transparent glass objects The solution is to increase the tracing depth until the black areas will disappear Figure 20 example render of interior scene where black areas behind transparent objects exist When rendering exterior scenes we don t need to use Field Mapping because the light conditions are good enough to illuminate our scene Using Field Mapping would only slowdown our render times and we would not gain any additional benefits The following images show typical artifacts that can occur when rendering exterior scenes and which settings can help in solving them For studio scene setups with HDRI we can also turn off Field Mapping as we have similar light condicions like using sun sky The clouds artifact can be solved by increasing Density Boost or enabling Adaptive Density T
5. Distribution options and Displacement select Channels These settings are similar to the rest engines and more Figure 2 Selecting the Adaptive BSD information can be found at user s manual engine at General panel BIASED RT RAY TRACING TAB At the Biased RT panel Ray Tracing we can see the following panels along with their corresponding settings Ray Tracing Termination Antialiasing Clay Render Direct Lighting Blurred Reflections Ambient Occlusion and Subsurface Scattering v Ray Tracing My Tracing Depth this value sets the global tracing depth for global s illumination and ray tracing Trace Reflections The default setting of 4 is a good and safe value to use and should A be changed only if black areas behind transparent objects will EE eee appear This kind of artifact is caused by unresolved areas of the global illumination computation caused by not using enough tracing depth Figure 3 Ray Tracing panel The value that we will set here is also the Default value for the materials reflection refraction ray tracing Each material can has its own tracing depth which will overwrite this global tracing depth value The material tracing depth settings can be found inside the Material Lab at the General panel of the material as seen in Figure 4 If the material tracing depth is set to Default then it will use the global tracing depth value Refractive materials though like glass may need hig
6. the cell size is too big in relation to the filed map density In this case you need to increase the field map density or reduce the cell size Tip a rule of thumb is to have the field density 100 times bigger than the cell size For example for a Field Density 300 000 the cell Size should be 300 These settings are a good starting point for setting up the Field Map Max Error this is the error threshold value for the Field Map calculation It has little impact on render times and leaving it at the default value of 2 is recommended 7 Caustics Fe Enable this option enables disabled the caustics Enable am calculation Sharpening Captured Photons Estimation Photons Sharpening with this option enabled the caustics will be sharpened but this can increase render times a bit Figure 13 Caustics Panel Captured Photons this value corresponds to the amount of caustics photons that will be captured If the light source is distant like the sun in an exterior scene more captured photons are needed Also the quality and accuracy of the caustics depend on the amount of captured 7 Copyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES i bo p rh aa a a es a m caustics used The more captured photons the more accurate the caustics pattern will be but render times will increase too Estimation Photons this value determines how many caustic photons will get mixed together Lower values will produce sharpe
7. AA subdivision value The maximum contrast value represents actually the maximum contrast between 2 pixels A good starting point for Max Contrast is 2 000 Lowering this value can produce better AA but with higher cost on render times Clamp Level Thea is rendering internally 32bit floating point images which have a high dynamic range This high dynamic range can make Antialiasing take much longer as the contrast between pixels can be very high leading to the need of higher settings for min max AA Subdivs The clamp level helps to solve this issue by clamping the highest levels and in this way avoid high contrast between 2 pixels The default value of clamp level is 1 000 and is good for most images Lowering this value too much can lead to luck of detail in bright areas and make the image look flat and washed out Tip 1 the Clamp Level parameter should be disabled when making Photometric analysis renders as it will clamp the irradiance level of the light and therefore will not produce accurate results Tip 2 Motion Blur sampling depends entirely on the global AA settings and needs high AA settings for smooth appearance Min AA of 4 and Max AA between 7 or 8 can be needed Tip 3 Depth of Field DOF is also controlled with the global AA settings In this case lower values like Min AA 2 and Max AA 5 can give satisfying results 7 Clay Render Enable this option enables the clay render mode Clay Enable E render mode will temporarily o
8. bdivision level for Min AA Subdivs antialiasing AA based on the Max Contrast setting Max AA Subdivs ay if the contrast between 2 pixels is below the Max Max Contrast Contrast value then the Min AA Subdivs value will Clamp Level iy be used If the contrast between 2 pixels is above the Max Contrast value then the Max AA Subdivs value Figure 6 Antialising Panel will bowed A basic starting point for Min AA Subdivs is 2 3 Copyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES i HOO h H mr aa eas E E F eee Max AA Subdivs sets the maximum subdivision level for antialiasing based on the Max Contrast setting If the contrast between 2 pixels is below the Max Contrast value then the Min AA Subdivs value will be used If the contrast between 2 pixels is above the Max Contrast value then the Max AA Subdivs value will be used A basic starting point for Max AA Subdivs is 4 Tip 1 increasing the AA value can lead to better antialiasing but with a significant penalty on ray tracing times Tip 2 if we set both Min Max Subdivs to the same value then the Max Contrast setting will be ignored as the same AA value will be used constantly Max Contrast this value sets the maximum contrast value threshold by which min or max AA subdivisions will be used Lower values of this percentage will trigger the maximum AA subdivision more than higher values which will use the min
9. ce value at 85 represents the whitest color we can see on any common material d Direct Lighting Enable to make the lights you have added in your Enable wae scene to illuminate it you need to enable direct lighting Adaptive Sampling i Option Max Error i vin Figure 8 Direct Lighting Panel Adaptive Sampling this option should be by default enabled It is an acceleration mechanism that improves render speed when many light sources are present Only for scenes where the light sources are limited like exterior scenes with only sun sky disabling adaptive sampling option could produce a small speed boost Max Error this value is the maximum error allowed for direct lighting computations Increasing this value can speedup ray tracing but can also introduce noise Very high values can also produce other unwanted artifacts The default value of 2 000 it a good and safe value to be used 7 Blurred Reflections Enable this option enables the sampling of blurred Enable reflections blurred reflections as we have already said Evaluate GI di are produced by materials that have a reflectance color Min Blurred Subdivs HE and a surface roughness higher then 0 Max Blurred Subdivs Figure 9 Blurred Reflections Panel Evaluate GI this option should be enabled by default because if we disable it then the blurry reflections will only get sampled by the direct lighting leading to missing reflections from indirect light areas 5 C
10. hadow clouds on walls or ceilings which can be treated with the density boost settings Higher values will produce more samples to smooth out these clouds and produce a nice clean image Recommended starting values are between 50 and 100 Increasing this value has a relatively low impact on render times except if we use very high values like 1000 and above we can type the value we want If needed for avoiding this increase of Density Boost there is another setting that we can use the Adaptive Density value Adaptive Density when rendering interior scenes adaptive density option should be always enabled It adds adaptively samples to the scene based on a contrast threshold Max Contrast option that follows which results in cleaner images without having to use higher Final Gathering Samples or high Density Boost values It increases render times but much less than the other settings when rendering interior scenes It can be used for exterior scenes too but with a significant render time penalty Max Contrast the max contrast is as we said a threshold value for the Adaptive Density sampling Based on this threshold number the Adaptive Density sampling will add more or less samples to the irradiance cache solution Lower values of this percentage will add more samples and higher values will add less The default 2 000 value is a good starting point and is often enough for good results with a moderate render time penalty Tip f
11. he fine details that would get lost because of the low Sample Density Note this value is render resolution dependent as its values are in pixels For small resolutions lower values are required and for high resolution renders a bigger minimum distance can be used Recommended values are between 0 100 and 4 000 depending on the render resolution A good starting point for high definition resolution is between 1 000 and 2 000 pixels Together with the Sample Density value the Min Distance px has a big impact on the final render times for the Irradiance computation The lower the value the bigger the times will be for the computation Tip finding the right balance between Sample Density and Min Distance px is almost the 80 of setting up a good GI solution Max Distance px this value sets the maximum distance in pixels for the Irradiance computation It goes hand in hand with the minimum distance value that we explained Low values will result in more samples and longer render times but can help to get more accuracy if we have used low Sample Density values Higher values will reduce render times as samples on big surfaces like walls and ceilings will be less The default value is 40 000 pixels which is a good balanced value for most scenes In case that sample problems will appear on big surfaces this value should be changed For very big resolution renders this value can be increased Compared to the min distance px
12. her tracing depth in some cases up to 25 In this case the tracing depth should be set in the Material Lab under the General panel for the glass material and not in the global ray trace panel for Adaptive BSD as it will then affect all the materials Tip increasing tracing depth has a moderate to high impact on ray tracing render times 2 Copyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES B f Eea eW A Glossy Depth this value sets the tracing depth for glossy materials The default value of 2 is enough for most cases and should be left like is It is also the Default value for glossy material ray tracing and can be overwritten by each material individually at the General panel of the Material Lab Trace Reflections enable disable tracing of reflections Trace Refractions enable disable tracing of refractions Trace Transparencies enable disable tracing of transparencies Trace Dispersion enable disable tracing of dispersion Default Figure 4 Tracing Depth for each material T Termination Russian Roulette is an acceleration mechanism for Russian Roulette y tracing reflection refraction based on a brightness Brightness yi H threshold Should be enabled by default as it helps to l E accelerate ray tracing Figure 5 Termination Panel Brightness is the brightness threshold for Russian Roulette and should be enabled by default T Antialiasing Min AA Subdivs sets the minimum su
13. just after the precomputation allowing us to save the result and use it for a later comparison with other settings w arf Tip Prepass Only and Visualize options are setup tools and Figure 17 Prepass and Visualize cannot be used for the final render they should be options enabled disabled CASE STUDIES ARTIFACTS AND THEIR SOLUTIONS At the next set of images we have used some example interior and exterior scenes to see some common artifacts that can be created and the settings that we need to adjust for avoiding them Tip as we have said the best way to start with the Adaptive BSD engine is to use the Basic presets interior or exterior and make then any needed changes to the settings if artifacts appear Note at the next sets of images we have used at the corner of each image a green or red triangle icon With the green triangle we show the desired result we have used the right settings while with the red triangle we tag the images that have artifacts and need further settings tuning 12 Copyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES Cn THEA RENDER With Thea Field Mapping technology we are able to render challenging light conditions without the need of tricks like additional light panels on windows openings or invisible fill lights to help the render engine These tricks alter the appearance of the natural light distribution and also increase the time to setup the scene
14. nder something useful for the cases we enable AO render pass channel for adding the stalin AO render later in post production High Color Samples Distance Multiply by default the ambient occlusion render will Figure 11 Ambient Occlusion Panel get added to the color render in additive mode which is good for interior scenes but for exterior scenes the multiply option is better suited By enabling this option multiply mode will be used instead of the default additive mode Clamp if clamp is enabled then the distance for all rays will be clamped to the distance of the shortest ray This will result in darker ambient occlusion assuming gray scale colors Samples here we define the sampling value for the ambient occlusion render 100 samples are the default value If the ambient occlusion render looks though too grainy higher sampling values should be used Distance this value gives the occlusion distance in meters Low Color this color defines the occlusion color High Color this is the ambient light color 6 Copyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES i lt rt aa a a Ss a m BIASED GI GLOBAL ILLUMINATION TAB At the Biased GI Global Illumination panel user can set the needed parameters that affect the Global Illumination of the scene At first there is the option to enable disable Field Mapping a new proprietary technique that evaluates consistently the lighting than canno
15. ng we would need probably more than 1000 samples depending on the light situation The number of samples is also depending if the Adaptive Density at the Irradiance Cache panel setting is enabled or not If it is enabled we can use less final gathering samples if disabled we will need more samples If the final gathering samples are too low blotchy artifacts can appear on the rendered image Increasing the sampling value has a moderate impact on render times Diffuse Depth this value is also affected by the field mapping and will change its behavior if field mapping is enabled or disabled With field mapping enabled the diffuse depth value serves as a corner and fine detail refinement If you get dark corners between the walls of your scene increasing this value will clean them up Typical values for diffuse depth are between 2 and 8 This value has a low impact on render times With field mapping disabled this setting will produce more diffuse bounces in the scene making the light bounces as many times the number of this value Typical values are between 2 and 8 High values may have moderate impact on render times 8 Copyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES Ho p lt ik a fo a p m m Max Error this is the maximum error value of the Final Gathering solution The default value is at 4 Changing this value has a low impact on render times It is recommended to leave this value as it is T
16. opyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES I leen ee Min Blurred Subdivs this is the minimum Antialiasing AA General samples value for blurry reflective materials This value sets WEIG the minimum AA samples that will be taken for blurry B i reflective materials All materials that have as Default the Min Blurred Subdivs at the General panel of the Material Lab will use this value This global value can be overwritten for each individual material by giving a different sample preps value as seen in Figure 10 Max Blurred Subdive Shadow Catcher Repaintable Perceptual Level Tracing Depth Max Blurred Subdivs this is the maximum Antialiasing samples value for blurry reflective materials This value sets the maximum AA samples that will be taken for blurry reflective materials All materials that have Default setting in the General panel of the Material Lab will use this value This global value can be overwritten for each material by giving to it a different Max Blurred Subdivs value as seen in Figure 10 Default Figure 10 Min and Max Blurred Subdivs for a material 7 Ambient Occlusion Enable this option enables ambient occlusion AO Enable rendering Affect GI Multiply Clamp Affect GI when enabled the ambient occlusion render will be added to the Global Illumination color render By disabling this option ambient occlusion will not be added to the GI color re
17. or scenes with difficult light situations for example a scene with small openings and indirect light only a value of 1 000 can often solve the situation without having to increase other settings for the irradiance cache Force Interpolation this is an acceleration mechanism that should be always enabled Only in rare cases when Min Max Distance px Prepass Level and or Sample Density cannot produce fine detail samples leading to discontinuous lines or missing samples on fine details disabling this setting is the last option for solving such cases Disabling this option though will increase render times significantly Prepass Only this option is by default disabled as it serves to stop the render automatically when the irradiance precomputation pass has finished Enable this option when you need to tweak the GI settings and want to see the GI solution before the final ray tracing It can help for analyzing the GI solution when using it in conjunction with Visualize option that follows 11 Copyright Solid Iris Technologies Soe i Ho p lt rh a fo a p m m Visualize by default this option is disabled Enabling it will show visually where Thea is adding the samples on the scene The samples will be represented with small red dots This feature is a tool that let us see if and where more samples should be taken and then accordingly we can tweak the GI settings Enabling Prepass Only option will make Thea stop the render
18. r caustics pattern but can require a high amount of captured photons to get a smooth caustics pattern Higher values can generate a smoother caustics pattern but can increase render times too Tip for sun pool caustics a value for Captured Photons between 1 000 000 and 5 000 000 with Estimation Photons between 50 and 200 will produce nice caustics pattern Caustics can add some additional time to the final render so these parameters should be used with caution T Final Gathering Enable this option enables Final Gathering Final Enable Gathering should be always enabled for the Adaptive BSD engine Compared to Field Mapping that should be enabled for interior scenes only Final Gathering needs to be enabled for all kind of scenes Samples Diffuse Depth Max Error 4m de ak S Trace Reflections Trace Refractions S Trace Glossy Reflections Trace Glossy Refractions S Figure 14 Final Gathering Panel Samples this is the amount of samples for final gathering Important note if we are rendering an interior scene or an exterior scene the amount of samples may change For interior scenes and if we are using field mapping too we can use a low amount of samples for final gathering but if we render the interior scene without field mapping enabled we will have to increase the final gathering samples a lot So with field mapping enabled a good starting point for final gathering samples would be 100 Without filed mappi
19. race Reflections by enabling this option the reflections of reflective materials will be traced To make render times better disabling this option can speedup rendering with nearly no visual loose in Global illumination quality this is why this option is disabled by default Trace Refractions this option which is enabled by default is used for tracing transparent material refractions Disabling this option can produce unresolved areas behind transparent objects resulting in black areas Trace Glossy Reflections this value which is disabled by default will trace glossy reflections Disabling this option can speedup rendering with nearly no visual loose in Global illumination quality Trace Glossy Refractions this option which is enabled by default is used for tracing the refractions of the glossy transparent materials Disabling this option can produce unresolved areas behind transparent objects something that creates black areas in rendered images T Irradiance Cache iF Enable this option enables the irradiance cache Enable computation Irradiance cache needs to be enabled as final gathering too for all global illumination computations Sample Density 5 Min Distance px Max Distance px Sample Density this value represents the density value of the irradiance computation in percentage In other words it defines how fine and detailed the computation will be This is a very important value as it controls the quali
20. reasing Final Gathering Diffuse Depth will add more samples on corners and dark shadow areas Use values between 2 and 8 The clouds artifact can be solved by increasing Density Boost or enabling Adaptive Density Try to increase Density Boost by 50 or 100 units until the clouds disappear The fine shadows on the TV model are showing some issues This kind of artifact is typically caused by a very low Prepass Level value Keep the Prepass Level above 2 1 Here we can see that some indirect light shadows are missing or are not accurate enough This indicates that the Irradiance Cache Sample Density is too low SOLIDIRIS We see here the same scene but with new challenging lighting conditions The only lights that are illuminating the scene are 2 lights hidden inside their light fixtures above the dining table Field Mapping once again shows its robustness solving this kind of scene without any tricks The room is mostly illuminated through reflected indirect light making this a situation where most other render engines would struggle and fail On the images at the left you can see at first the results with Field Mapping enabled and then with Field Mapping disabled Final Gathering and Irradiance Cache settings stay the same p When edges and small details start to lose definition and look dirty the problem is the use of a very big Min Distance px value Reducing this value between 1 000 and 4
21. ry to increase Density Boost by 50 or 100 units until the clouds will disappear y Harden Gare o aa aA a AE When edges and small details start to lose The fine shadows are showing some issues Here we can see that some indirect light characteristic mixture of small and big bright definition and look dirty the problem is a This kind of artifact is typical for a too low shadows are missing or are not accurate spots This is clearly a sign of not enough too big Min Distance px Reducing this Prepass Level Keep the Prepass Level above enough This indicates that the Irradiance Final Gathering samples value between 1 000 and 4 000 should solve Zale Cache Sample Density is too low this issue Figure 21 exterior scene rendered without Field Mapping 15 Copyright Solid Iris Technologies
22. t reach easily the viewer After this panel we can see the Caustics the Final Gathering and the Irradiance Cache panels T Field Mapping Enable this option is used to enable disable field mapping Sit Tip field mapping should be enabled for interior scenes as it will help to accelerate the global illumination calculation For exterior scenes field mapping should be disabled as exterior scenes will not benefit from the field mapping approach slower renders for exterior scenes Force Nearest Cell Field Density 7 ao Cell wlze all 5 F F3 mE ka Max Error 3 Figure 12 Field Mapping panel Force Nearest Cell this option when enabled accelerates the field mapping calculation and should be enabled by default when using field mapping Tip if light leaks will appear at finale render disabling this option can help to avoid these leaks Field Density this value defines the field map density Higher values will give a denser map and therefore a more accurate solution Low values can lead to light leaks or blotches Recommended values for better results are between 100 000 and 2 000 000 High values have an impact on Field mapping calculation times when rendering Cell Size this value gives the size of the field map cell Higher values produce a more accurate field map Preferred values are between 100 and 2 000 For higher values you may need to increase Final Gathering samples too Small blotches can appear if
23. t way to start with the Adaptive BSD engine is to use the Basic presets interior or exterior and then make any needed changes to the settings if any artifacts appear Figure 1 Biased Engine Adaptive T Engine Core Moton Blur Displacement Distribution Threads Priority Network T Channels Normal Depth Alpha Object Id Material Id Direct Reflection Refraction Transparent Irradiance BSD Note Adaptive BSD engine is very useful for normal to very complex scenes and excels in scenes where many lights are used thousands of lights or where the light sources are hidden and the scene only gets light through bounced indirect illumination With Thea Adaptive BSD engine there is no need for sky portals or other tricks to help the Global Illumination solution with Thea lights are used just like they exist and used in reality By testing this engine with a very simple scene such as a simple plane with a cube on top of render times will not be that impressive as for more complex scenes which actually represent the real word working scenes Version used for this Tutorial Presto Edition v1 2 03 Build 905 SOLIDIRIS TECHNOLOGIES oe Fe ee ee GENERAL TAB 7 At the general tab some very generic options exist that Engine Core 7 2 kam allow us to select the render engine Adaptive BSD kay set up the supersampling enable disable Motion Blur Motion Blur and Displacement define
24. ty of indirect light shadows and other fine details Fine details could be characterized the contact shadows the very small spaces between objects and other small details of the scene Prepass Level Density Boost Adaptive Density Max Contrast S 48S 48 a de ae ae S Force Interpolation Prepass Only I Visualize Figure 15 Irradiance Cache Panel ee Tip it is one of the settings that will have an important impact on render times High values will increase render times a lot while low values will render faster but final image may luck of some fine details of the indirect light calculations Recommended values are between 65 and 95 By setting the value to 95 render times will be increased significantly Values between 75 and 85 will produce good results with fine details and moderate time penalty for final render Min Distance px this value sets the minimum distance in pixels for fine detail sampling Tip giving to the minimum distance a very big value can lead to a floating appearance of objects missed contact shadows or lack of contrast on fine details 9 Copyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES bo p rh aa a a es a m On the other hand very low values can lead to high render times especially for scenes with a lot of fine details present and for high Sample Density values If the Sample Density is low a low minimum distance could resolve t
25. verwrite all materials Reflectance ie with a diffuse gray material except the transparent materials like thin film Disabling this option will render the original scene materials again Figure 7 Clay Render Panel Tip clay render can be used as a render style or for setting up the Global illumination and exposure settings for your scene as it renders much faster than the same scene with its original materials It renders faster because all materials are just diffuse materials which is the type of material that renders faster The original materials of the scene will probably consist of a variety of different materials and some of them may have reflections refractions and blurry reflections refractions Blurry reflective refractive materials are the ones that need the longest time to be rendered Blurred reflections are produced by materials that have a reflectance color and a surface roughness higher than zero 4 Copyright Solid Iris Technologies SOLIDIRIS TECHNOLOGIES Ho p lt rh a fo a p m m In such cases enabling clay render saves render time for ray tracing and we can concentrate on Global Illumination setup and getting a nice exposure Reflectance when clay render is enabled the reflectance values will be available With this value we set the reflectance in of the clay material li is better to avoid using a value of 100 as this will result in unrealistic too bright renders A reflectan
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