Interface ColormapAwareMaterial

Bind a colormap LUT texture (or null to disable colormap mode).

When texture is non-null, the USE_COLORMAP define is added and the uniforms (uColormapTex, uScalarMin, uScalarScale) are allocated with neutral defaults if they don't exist yet. When texture is null, the define is removed and the uniform values are cleared so a subsequent clone() doesn't resurrect a stale colormap.

No-op when called on a material whose shader path doesn't include USE_COLORMAP-guarded uniforms.

Update the scalar range [min, max] the colormap maps over. Encoded as uScalarMin = min and uScalarScale = 1/max(1e-10, max-min) for the shader. No-op when colormap mode is not active (uniforms are absent until setColormapTexture has been called once).