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The reason for issue is that when the ARB interaction shader was ported to GLSL, some clamps got missing. Here is the full story: http://forums.thedarkmod.com/topic/19064-glsl-interaction-shader/page-10#entry432850 |
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Fixed in rev 15546. Note that while clamps are exactly the same, and the code is logically the same, one subtle difference from the ARB version remains. In ARB version, all dot products (NdotL, NdotH, NdotV) were computed from TANGENT-space normal and directions. In GLSL version, all these dot products are computed from world-space normal and directions. The difference means slight difference in interpolation errors. UPDATE: There was an error in the initial description saying that ARB version used object space. It used tangent space, which makes a big difference. Anyway, it turns out that interpolation matters. |
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Follow-up problem: http://forums.thedarkmod.com/topic/19774-beta-testing-207/page-10#entry433034 |
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Fix confirmed on WS4. Since the follow-up problem is now resolved, this one can be set to fixed, too. |
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Since beta207-06, this problem happens again. It is caused by moving from world space back into tangent space (which is required for good mesh smoothing). I compared it with TDM 2.05, and the problem happens there too. I think this problem will not be in shader: the crate itself has to be fixed. Something is wrong with it. |
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Attached an image obtained using: r_showTangentSpace 3 r_skipAmbient 3 r_skipInteractions 1 It shows normal of each fragment encoded into color. It is clear that good crates have flat normal with sharp changes on the edges, while the crates with the problem have smoothly changing normal over a large flat face, and sometimes normal even changes smoothly from one face to another when going over an edge. |
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In my opinion the model of the crate is bad. This is the map-specific model (I guess a merge of several standard models): // entity 6909 { "classname" "func_static" "name" "func_static_1140" "model" "models/darkmod/map_specific/steele/smythe_5.lwo" "origin" "5449.81 1280.2 564.684" "rotation" "1 0 0 0 1 0 0 0 1" } I'm moving this to mapping category, assigning to author for now. Also reducing priority/severity, since it does not stop players from enjoying the FM. |
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Removing myself as "Assigned To" because I doubt I will ever have time to work on it. |
- Anonymous
