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codeanticode
43 lines
1.0 KiB
Plaintext
43 lines
1.0 KiB
Plaintext
/**
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* Ortho vs Perspective.
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*
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* Click to see the difference between orthographic projection
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* and perspective projection as applied to a simple box.
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* The ortho() function sets an orthographic projection and
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* defines a parallel clipping volume. All objects with the
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* same dimension appear the same size, regardless of whether
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* they are near or far from the camera. The parameters to this
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* function specify the clipping volume where left and right
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* are the minimum and maximum x values, top and bottom are the
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* minimum and maximum y values, and near and far are the minimum
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* and maximum z values.
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*/
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void setup()
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{
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size(640, 360, P3D);
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noStroke();
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fill(204);
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}
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void draw()
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{
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background(0);
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lights();
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if(mousePressed) {
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float fov = PI/3.0;
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float cameraZ = (height/2.0) / tan(fov/2.0);
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perspective(fov, float(width)/float(height),
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cameraZ/2.0, cameraZ*2.0);
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} else {
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ortho(0, width, 0, height);
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}
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translate(width/2, height/2, 0);
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rotateX(-PI/6);
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rotateY(PI/3);
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box(160);
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}
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