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Topic: ScreenZ and objectZ ?s (Read 316 times) |
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flight404
 
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ScreenZ and objectZ ?s
« on: May 10th, 2004, 8:42pm » |
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Why would screenZ give any number besides maybe 0 or 1. If I understand the screenZ command correctly, it takes the position of an object in space and tells you what the z axis information would be for that object on a 2 Dimensional screen aka the monitor. Should it even exist at all? and if so, what would be a possible use.
I was getting a range of numbers in the .992 -> .996 range for the project I am working on. I tried it as an a possible solution for my actual dilema.
When using beginCamera and rotateX,Y, or Z, my objectZ result is not what I would desire.
Code:
void doCamera(){
distance = 100.0;
beginCamera();
perspective(60.0f, (float)width / (float)height, 1.0f, 500);
translate(0, 0, -distance);
twist = radians(mouseX / 2.0f);
elevation = radians(mouseY / 2.0f);
rotateY(-twist);
rotateX(elevation);
rotateZ(-azimuth);
endCamera();
}
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When using this camera code (I think a gift from Malka... not sure), my objectZ doesn't give me what I hoped (the virtual distance from me to the object), instead giving me the distance from me to object if I apply no rotations.
Am I making sense? thoughts?
r
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flight404
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Re: ScreenZ and objectZ ?s
« Reply #1 on: May 10th, 2004, 8:45pm » |
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Oh crap. After some manipulating the result of screenZ, it seems that was what I wanted after all.
Which leads me to my revised final question...
What would be an example of a use for screenZ and a use for objectZ?
r
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arielm
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Re: ScreenZ and objectZ ?s
« Reply #2 on: May 11th, 2004, 12:35am » |
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yep, the camera code could be a mutant offspring of this old one...
(concerning screenZ and its utility: we share the same un-understanding!)
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Ariel Malka | www.chronotext.org
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