Stage (0) of the pipeline, shared with the raw HDR capture path: the scene into the
HDR target. Binds and clears the target, then either lets the refraction split draw
the frame in its passes (glass depth, data behind, glass, data in front) — when some
visible glass asks to refract the data — or renders the scene once, exactly as
before Phase 3. Leaves the HDR target bound.
Stage (0) of the pipeline, shared with the raw HDR capture path: the scene into the HDR target. Binds and clears the target, then either lets the refraction split draw the frame in its passes (glass depth, data behind, glass, data in front) — when some visible glass asks to refract the data — or renders the scene once, exactly as before Phase 3. Leaves the HDR target bound.