support RGBA color values

[lidaof]

Is it possible to support RGBA color values? I am trying to color one chain with a color function using resi to assign colors?
I would like resi not selected to be a little bit transparent, tried using RGBA or hex code with alpha not working.

Thanks.

[dkoes]

opacity can be set as a separate parameter, like here:
https://3dmol.csb.pitt.edu/tests/auto/generate_test.cgi?test=test98

But I agree that also supporting RGBA values would be convenient.

[dkoes]

What would be your preferred syntax for specifying rgba in one value? It doesn't seem to be common to use hex.

[lidaof]

Agree, i think css rgba way is more common. Thanks for consideration.

[dkoes]

I've added support for parsing rgb(a) color specifications, but any alpha value will be ignored and warning message generated on the console saying to use the separate opacity property. Fully supporting rgba would require crawling through any style specification to identify rgba specifiers and creating separate opacity properties.

[lidaof]

thanks you @dkoes

[lidaof]

Hi @dkoes, rethinking about this issue, is it possible to allow colorfunc to return an object with opacity instead of just a color string? Thank you in advance for consideration.

[jaxmatrix]

I have another thought on this lets not change the way color works but rather the way the shader is processing the color. Inside the fragment shaders we can change varying vec3 vColor to varying vec4 vColor and gl_FragColor = vec4( vColor.x, vColor.y, vColor.z, vColor.w*opacity) this will accommodate both rgba colors along with opacity. And in the renderer loading of the color uniform can be done using this._gl.uniform3f(uniformLoc, uniformVal.r, uniformVal.g, uniformVal.b, uniformVal.a ? uniformVal.a : 1). These are just my initial thoughts, I still don't know what other changes might be required.

[dkoes]

That only works if everything is properly depth sorted (so everything beneath the transparent fragment has already been drawn to the buffer before you color max). Unfortunately, that's not true (transparency is hard).