Hello Mark, on Montag, 15. Oktober 2007, 17:58:56, you wrote:
> Hi Marc, > Well done: a very important subject, everybody dabbling with 3d will have to > deal with this. > My 2 cts: the aliasing problem can also occur in procedural textures. And not only there, but also the problem exists with geometry objects. I have tried it with a fence. In it's simplest form, it's only a line up of rectangles. When I setup up a level of 1 in the rendering anti aliasing settings with the method geometric the distance between the rectangles differs slightly. If I switch to stochastic all distances are the same, but I get noise. Raising the anti aliasing level to the max helps and improves the image qualtity. But even then I see differences of the two methods in the rendering. So the right method depends on the type of scene. > There's no specific source texture size... instead, we're dealing with > mathematical noise, cells, tiles or other pattern-generating sources. Quick > conclusion: don't set Octaves higher than necessary and try to use material > antialiasing (Material properties -> General tab). > I had some difficulty setting up the AA for such materials: the Antialiasing > value combined with Threshold, U and V samples, and this combined with the > current Render settings... a lot of trial&error and test rendering required! I often dont use the anti aliasing setting of the material. Only at very specific materials. In the rendering settings, I set a high level of anti aliasing, often level 6 and use a high threshold. With scenes which consists of smooth surfaces and hard edges its possible to set the threshold to 100. The rendering speed is near the same as a rendering with anti aliasing level 1, but with a great improvement in the image quality. > And then there's mip-mapping: switching and blending closeup and far-away > textures depending on distance to the camera. Scripting, V6? Interesting option, we will see if it is really useful. > Many thanks, I hope you'll expand this page, Yes, the page isnt finished yet. But when times comes by I will step by step add some more topics and refine the whole thing. -- Best wishes, Marc Michael
