What's killling my model?
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I have a very simple airplane hangar model and I am using displacement on the shell because it is a PBR panel. Now I tested the material on its own and it works great. The model is setup correctly with the displacement parts in their group. The displacement map is grayscale. The displacement settings are really not that high - edge of 4.0 and subdiv of 256 (defaults I believe). So the thing takes FORVER to run the LC pass. What gives?
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strange...
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two thoughts -
did you subdivide your geometry - the smaller the triangles of the faces, the better displacement is handled.
try a different viewpoint - displacement is resolution dependant, and your view can affect your render times. -
Now I totally do not understand how displacement is calculated. The rendering runs much better if I use incredibly low subdiv settings like 1 but if I use the default of 256 it takes 10 times as long. Now the thing I do not understand is that the displacement actually looks about the same with a subdiv of 1 as it does with 256 (the default)and they both render in the same amount of time when put into a test model like the attached. What gives?
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Ok, feel like a total idiot. Of course they look the same! My override settings were dictating what the displacements setting were! When I change the override to 1 subdiv, it's a mess. So that's one issue solved.
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The other thing I was able to determine was that my edge length was set very low (4) for the resolution I was rendering (4k pixel wide render). As soon as I turned it up to 10 it was much faster calculating. Can you guys share what settings you typically use in order to get the best speed and best looking displacement. I know its all dependant on the map and what you are looking to get from it, but in general for a high res image. Is it something as high as 10 or higher?
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