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popwfx

Why do closed objects perform better for painting than open ones?

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Please help me understand 3DC a bit better. I'm trying to paint on a lowpoly object and if I just load the plane I want, 3DC performs very badly painting on just the surface when painting with materials. If however I load the same surface but have it a closed contiguous object like a block (so it has under and side and back and front bits - not just the block's top) then it performs better. See this attached pic to see what I mean. This is the model - I was just trying to load the top of it - but would prefer to keep the geometry how I need it. I don't want 3DC to create UV maps (or at least not much space on the map) for the non-top areas since they wont be seen from my camera anyway..

If I load just the selected polys here into a separate object and load that into 3DC it chugs badly when trying to paint. And it's not the video card or driver. Why is this so? thanks :)

block.jpg

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sorry for not being clear. I mean very slow. As in, despite my normally speedy enough graphics card, painting on a plane (unclosed object) is much slower than on a closed object. I am using v 3.718f (though I did download and try v4Beta5 and experienced the same thing).

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Actually, if your pixel density is equal in both cases then performance will be the same. So it's quite dependent of your texture size per UV island (pixel density) and brush size, of course.

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In your case, when you load your solid model, the top part of it (the one that you need) covers only the fourth part of the UV texture! That's why you experience better performance with solid one!

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