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Packs a tint and opacity into the 32-bit word ParticleContainer3D.writePacked takes
Red lands in the low byte and alpha in the high byte, as ParticleContainerViews.u32 holds the colour.
0xRRGGBB tint, in display (sRGB) space
0xRRGGBB
Opacity, 0 to 1
The packed word
Packs a tint and opacity into the 32-bit word ParticleContainer3D.writePacked takes
Red lands in the low byte and alpha in the high byte, as ParticleContainerViews.u32 holds the colour.