Second self-contained-GL-state fix (after uViewProjection): EnvCellRenderer.Render set
BlendFunc per-batch but never the BLEND enable or DepthMask. The opaque shell pass —
drawn after terrain (which sets neither) and after particles / last frame's transparent
pass — inherited whatever left GL_BLEND enabled, making opaque walls composite their
sub-1.0-alpha textures against the bluish clear color (terrain Skip'd indoors) →
"transparent walls / only background," flickering with per-frame ordering. Mirror the
working WbDrawDispatcher: Disable(Blend)+DepthMask(true) opaque, Enable(Blend)+
DepthMask(false) transparent, restore opaque defaults after the draw loop.
Does NOT address the threshold "flap" (OutsideView instability from the per-frame
view-dependent BFS) — that is a distinct, deeper root cause tracked separately.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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