Set an extra WORLD-SPACE radius added to every instance's GPU-culling sphere.
The culler derives each instance's sphere from the prototype's authored vertex bounds, so a
vertex shader that DISPLACES geometry beyond them — terrain-following height offsets, tall wind
sway, growth animations — can move a visible instance outside its sphere and pop it at the
screen edge. The usual workaround is disabling culling for the whole mesh; padding the sphere
by the maximum shader displacement instead keeps culling both correct and enabled.
The pad is in world units, applied after per-instance scaling. 0 restores the exact authored
bounds. Takes effect on the next culled pass (the culler reads it when writing its per-pass
params), so it can be changed live.
Set an extra WORLD-SPACE radius added to every instance's GPU-culling sphere.
The culler derives each instance's sphere from the prototype's authored vertex bounds, so a vertex shader that DISPLACES geometry beyond them — terrain-following height offsets, tall wind sway, growth animations — can move a visible instance outside its sphere and pop it at the screen edge. The usual workaround is disabling culling for the whole mesh; padding the sphere by the maximum shader displacement instead keeps culling both correct and enabled.
The pad is in world units, applied after per-instance scaling. 0 restores the exact authored bounds. Takes effect on the next culled pass (the culler reads it when writing its per-pass params), so it can be changed live.