3dvizual Posted August 14, 2012 Share Posted August 14, 2012 Is it possible to only use the displacement maps on selected objects to reduce render time.? Link to comment Share on other sites More sharing options...
Chris MacDonald Posted August 14, 2012 Share Posted August 14, 2012 Yes, do your displacement through the VRaydisplacement modifier (not the material), it'll do exaxctly what you're looking for. Link to comment Share on other sites More sharing options...
3dvizual Posted August 14, 2012 Author Share Posted August 14, 2012 Great thanks. I will give it a try. Link to comment Share on other sites More sharing options...
3dvizual Posted August 14, 2012 Author Share Posted August 14, 2012 My render times on a 4500 pixels image goes from 1,5 hour up to 160 hours with turning on the vraydispl. modifier. That can not be real.?? Some advice. the area of the image I need displacement on is about 2% of the image area. Is it better to model the pavement as 3d mesh and turn off the displacement..? Link to comment Share on other sites More sharing options...
Chris MacDonald Posted August 14, 2012 Share Posted August 14, 2012 VRay displacement by default only works on geometry deemed to be large enough (the edge length, measured in pixels setting) to see. So even if you had it on your entire model, it would only actually displace the bits that are visible/close enough to warrant calculating. I never, ever use the max estimated time to gauge how long renders will take until it actually gets past the pre-calcs and on to the actual render, and even then I take it with a pinch of salt. Try letting it run past the light cache/displacement pre-calcs and see how long it actually takes. Link to comment Share on other sites More sharing options...
3dvizual Posted August 14, 2012 Author Share Posted August 14, 2012 OK. I will give it a try. But would it be better to make a 3d mesh of a pavement instead:? Link to comment Share on other sites More sharing options...
Chris MacDonald Posted August 14, 2012 Share Posted August 14, 2012 Depends how much detail you're aiming for? Got an image for us? screenshot? Link to comment Share on other sites More sharing options...
3dvizual Posted August 14, 2012 Author Share Posted August 14, 2012 https://www.dropbox.com/s/1av8v3sjsw1nlm4/floor.jpg Link to comment Share on other sites More sharing options...
Chris MacDonald Posted August 14, 2012 Share Posted August 14, 2012 Images don't work? Link to comment Share on other sites More sharing options...
3dvizual Posted August 14, 2012 Author Share Posted August 14, 2012 try the link again. Link to comment Share on other sites More sharing options...
Chris MacDonald Posted August 14, 2012 Share Posted August 14, 2012 Displacement should be able to handle that with ease. What I find often speeds up displacement is subdividing the geometry (quadify mesh works well) into squares of about 500 to 1000mm. Displacement mod can only subdivide a max number of times per poly (the max subdivs setting) - if it has more polys to work with to begin with I find it is generally a lot less taxing at render time. Link to comment Share on other sites More sharing options...
3dvizual Posted August 14, 2012 Author Share Posted August 14, 2012 OK. thanks. I will try to let it render for a longer time, or else I will try your suggestion. Thanks for your help. Link to comment Share on other sites More sharing options...
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