Reduce seam in water refraction #1718
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URAKOLOUY5
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ficool2
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Dec 20, 2025
src/game/client/viewrender.cpp
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| m_DrawFlags = DF_RENDER_REFRACTION | DF_CLIP_Z | | ||
| DF_RENDER_UNDERWATER | DF_FUDGE_UP | | ||
| DF_DRAW_ENTITITES ; | ||
| DF_DRAW_ENTITITES | DF_RENDER_ABOVEWATER; |
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This leads to a significant performance penalty as geometry above the water will be rendered twice (CAboveWaterView setup also adds this flag)
Removing this flag shows that the offset height hack doesn't work in isolation. The flag by itself fixes the issue, but this trade off in performance is not worth it
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The updated version of this PR leads to noticeable seams where the water intersects geometry 
It also breaks the height depth blending effect, as noticeable here Stock: PR version: |
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This PR adjusts water clipping plane by 4 units up, enough to fix visible seam
Note: it leads to x2 performance usage as it renders view above but clips it early
Before:
After:
