Different Alpha blending in P2D and P3D

Programming Questions

blooop15

Different Alpha blending in P2D and P3D

in Programming Questions • 1 year ago

void setup() {
//size(100, 100, P2D);
size(100, 100, OPENGL);
hint(DISABLE_DEPTH_TEST);
}
void draw() {
background(127);
line(0, 0, 100, 100);
rect(20, 20, 40, 40);
}

If I use the P2D renderer the black diagonal line is covered by the last draw rectangle. If I use P3D or OPENGL, the diagonal line is not covered even though I use hint(DISABLE_DEPTH_TEST); How can I recreate the rendering settings of P2D in P3D or OPENGL?

Thanks

Replies(2)

amnon.owed

Re: Different Alpha blending in P2D and P3D

1 year ago

You should mention that you are using an alpha version of Processing 2.0 because it is relevant to your issue. In Processing 1.5.1. all renderers (JAVA2D, P2D, P3D, OPENGL) give the same result. In Processing 2.0a P3D/OPENGL give a different result indeed. To solve this, slightly move the line to place it behind the rect.

Adapted Code

void setup() {
size(100, 100, OPENGL);
}
void draw() {
background(127);
line(0, 0, -1, 100, 100, -1);
rect(20, 20, 40, 40);
}

blooop15

Re: Different Alpha blending in P2D and P3D

1 year ago

Thank you!

I didn't know there was this difference between 1.5.1 and 2.0a5. I think I will go back to 1.5.1.

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