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Topic: drawing order and alpha (Read 525 times) |
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aileron
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drawing order and alpha
« on: Feb 13th, 2004, 9:21am » |
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Noticed that alpha transperancy of an object only wants to work correctly on objects drawn before it.
Code:
int camX = 300;
int camY = 200;
int camZ = 0;
int camrotX = 0;
int camrotY = 0;
int camrotZ = 0;
int rotate1 = 0;
void setup() {
size(600, 400);
rectMode(CENTER_DIAMETER);
}
void loop() {
background(100);
stroke(200);
if(keyPressed){
if(key == UP)
camrotX+=2;
if(key == DOWN)
camrotX-=2;
if(key == RIGHT)
camrotY-=2;
if(key == LEFT)
camrotY+=2;
}
translate(camX, camY, camZ);
rotateX(camrotX*(PI/180));
rotateY(camrotY*(PI/180));
rotateZ(camrotZ*(PI/180));
rotate1++;
if(rotate1 > 359)
rotate1 = 0;
fill(100,105,60, 150);
box(0,0,0, rotate1,rotate1,rotate1, 50);
fill(100,60,60, 150);
box(100,0,0, 0,0,0, 50);
box(-100,0,0, 0,0,0, 50);
}
void box(int x, int y, int z, int rotX, int rotY, int rotZ, int size){
push();
translate(x,y,z);
rotateX(rotX*(PI/180));
rotateY(rotY*(PI/180));
rotateZ(rotZ*(PI/180));
box(size);
pop();
}
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And it seems to me that a 3d object should alpha its own rear edges, does it not do that on purpose?
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| « Last Edit: Feb 13th, 2004, 9:24am by aileron » |
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fry
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Re: drawing order and alpha
« Reply #1 on: Feb 13th, 2004, 7:23pm » |
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yeah, that's an artifact of most 3D renderers (opengl has the same problem). we may switch to actually sorting all the polygons back to front first, but that would only be if/when we move to the new graphics engine.
(edit) actually, we'll prolly just offer it as an option. it's a speed hit to enable it, but i know that it's often worth it.
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| « Last Edit: Feb 13th, 2004, 7:25pm by fry » |
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