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thurber

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  1. Hi,   I thought I'd respond to this thread in case it helps anyone solve the same issue that I was encountering. I finally worked out that if I rendered in wireframe mode, the edge pixels would always get drawn. When combined with solid rendering this results in the entire UV area being covered, so when sampling the texture it looks correct.   In case you're interested, my aim was to bake ambient occlusion fields to textures. I've written this up in a blog-post here: http://blog.mattdev.com/baked-ambient-occlusion-fields-in-cloud-racer/.   Thanks again for the useful discussion, it helped set me on the right path to work this out. Finally, some pictures...   Here is just solid rendering:     Here is the wireframe rendering:   When combined, you get this:
  2. Thanks for the replies, Hodgman & Jason Z!     Yes. I've also got the results rendering in my game (and looking the same), but I found the texture coordinate view in Softimage useful - and obviously it's safer to use their rendering code, in case something is wrong in another part of my setup :).   Your comments about differences in rasterization versus texture sampling have given me some ideas. I'll do some more research into that, and post again once I've got some results.   Cheers
  3. Hi there,   I'm trying to render out to a texture based on a mesh's UV coordinates, with the intention that I can then use this texture on the mesh. I've run into a problem which has had me stumped for ages... so *any* help would be gratefully received!   Here's my vertex shader (I'm using D3D9 btw):     VertexToPixel VertShader(VertexInput input) {     VertexToPixel Output = (VertexToPixel)0;     // Output position of the vertex is the same as the UV coordinate of the vertex     Output.Position.xy = input.TexCoord.xy;     // Half-pixel offset; not sure if required...?     // Output.Position.xy -= float2(1.0/fTextureResolution,1.0/fTextureResolution) * 0.5;     // Transform to clip-space Output.Position.y = 1.0-Output.Position.y;      Output.Position.xy = (Output.Position.xy) * 2.0 - 1.0; Output.Position.zw = float2(1.0, 1.0); return Output; }       The pixel shader is set to just output red for testing, and the clear colour is black. My test mesh is two triangles, as seen below. You can see that the output *almost* matches up with the mesh UVs, but there are slight black fringes around some edges (left panel is the texture editor, with UV outlines shown in yellow).     My initial thought here was that it needed a half-pixel offset (see http://drilian.com/2008/11/25/understanding-half-pixel-and-half-texel-offsets/); I'm outputting to a texture from clip-space, so it kinda makes sense that I'd need that translation... but please tell me if I'm wrong on that.   However, I've tried it with half-pixel offsets in all directions, and there's always at least one edge which has fringes:     Zoomed in:   At this point, I'm quite confused. I've generated these UVs in Softimage (using "Unique UVs (polymesh)") for a "target resolution" of 256x256, and I've output a texture of 256x256 using a *very* simple vertex/pixel shader... and it seems like no amount of offsetting can get it to line up correctly - there's always a fringe of black pixels in the mesh.   This happens with any mesh I throw at it, btw. Here's a torus that I tried:     My only other thought has been to try to use Direct3D's "D3DXCreateTextureGutterHelper" group of functions to try to add gutters, and I've had very limited success with that too; but I suspect the main problem is with something I've outlined above. As I understand it, gutters shouldn't be necessary at all unless I'm using bilinear filtering, which I'm not doing in these tests.   Can anyone see what's going wrong? Any thoughts would be greatly appreciated, and please let me know if any more details are required.   Cheers, Thurber