Transparency problem

Programming Questions

railon

in Programming Questions • 27 days ago

void setup() {
size(200,200,P3D);
noStroke();
}
void draw() {
background(0);
pushMatrix();
translate(mouseX,mouseY,0);
fill(255,0,0);
sphere(20);
popMatrix();
hint(DISABLE_DEPTH_TEST);
fill(50,0,0,100);
rect(0,0,100,100);
hint(ENABLE_DEPTH_TEST);
}

Even though I set the alpha value of the rectangle to 100, it doesn't have any transparency when the circle is behind it and I'm not sure why.

Replies(5)

kooogy

Re: Transparency problem

27 days ago

documentation for fill() says:

"the default color space is RGB, with each value in the range from 0 to 255"

so 100 isn't full transparency, it's about half...

also, which version of processing?

PhiLho

Re: Transparency problem

27 days ago

Tried in Processing 2.0.0, works for me, I can see the circle half-dark red.

railon

Re: Transparency problem

26 days ago

Strange, in the Processing 2.0.2 IDE and processing.js shown here it doesn't work, the box is completely opaque and the circle completely disappears behind it.

Not sure where to go from here, lol. Was this recently updated in Processing? I know my IDE is like two tiny versions behind.

PhiLho

Re: Transparency problem

26 days ago

I saw a message reporting transparency issues in 3D in 2.0.2, being solved in 2.0.3, IIRC.

railon

Re: Transparency problem

26 days ago

Yup it works in 2.0.3, any idea how soon this will be reflected in processing.js?

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