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Topic: beginShape(LINE_STRIP) (Read 1559 times) |
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flight404
 
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beginShape(LINE_STRIP)
« on: May 23rd, 2004, 5:47am » |
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Having an issue that I cannot wrap my head around.
http://www.flight404.com/p5/radial_0/
The problem in question is that the strokes should get darker the further away they get from the center of the spikeBall.
Code:
beginShape(LINE_STRIP);
// set color for first point to be white
stroke(255);
// set position of first point to be the center of the 3D space
vertex(0,0,0);
// set color for the last point to be black
stroke(0);
// set position of last point to be a specific distance from the center
vertex(0,0,50);
endShape();
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For some reason, if the line exists to the left of center, the stroke inverts somehow. Might it be a facet of the beginCamera() code that I am not aware of? I searched around but couldn't find any relevant posts. Thoughts?
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TomC
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Re: beginShape(LINE_STRIP)
« Reply #1 on: May 23rd, 2004, 9:46pm » |
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Not sure how you're drawing code works - one too many layers of misdirection for a Sunday night 
Have you managed to reproduce that problem with more minimal code?
What does your camera code do to this?
Code:
int NUM_SPOKES = 36;
float SPIKE_LENGTH = 125.0;
void setup() {
size(400,300);
}
void loop() {
background(0);
translate(width/2,height/2);
rotateY(TWO_PI*mouseX/width);
rotateZ(TWO_PI*mouseY/height);
for (int i = 0; i < NUM_SPOKES; i++) {
push();
rotateX(i*TWO_PI/NUM_SPOKES);
beginShape(LINE_STRIP);
stroke(0);
vertex(0,0,0);
stroke(255);
vertex(0,0,SPIKE_LENGTH);
endShape();
pop();
}
}
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(edited code to make the method similar to the original)
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| « Last Edit: May 23rd, 2004, 9:53pm by TomC » |
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flight404
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Re: beginShape(LINE_STRIP)
« Reply #2 on: May 23rd, 2004, 9:56pm » |
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Same result. The lines to the left of center seem to draw from the outside->in and the others, inside->out. Is there some rule that beginShape() draws from the left to the right? I can't imagine that would be the case.
Should this be filed as a bug is the question.
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arielm
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Re: beginShape(LINE_STRIP)
« Reply #3 on: May 23rd, 2004, 10:29pm » |
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pasted TomC's simplified test-case into version 0066 (the highest installed on my machine) and it behaves as intended (all the rays are darker towards the center of the round)
robert: which version do you use?
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Ariel Malka | www.chronotext.org
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flight404
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Re: beginShape(LINE_STRIP)
« Reply #4 on: May 23rd, 2004, 10:58pm » |
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I am on v69. OSX 10.3.1.
UPDATE----------------
Here is what I see when I paste Tom's code directly into v69 Processing without using the camera method (which I guess isn't part of the problem).
http://www.flight404.com/p5/radialProblem.gif
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| « Last Edit: May 23rd, 2004, 11:49pm by flight404 » |
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