A GradientTexture1D varies along U, so the cone showed a bright ring; build a 1×64 vertical ramp for UV.y instead (faint at the lens, brightest near the start, gone before the tip). Regenerate the affected captures; headless 227/227, compare 11 good / 0 bad.
1.2 MiB
1280x720px
1.2 MiB
1280x720px