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42 lines
1.2 KiB
Plaintext
Executable File
42 lines
1.2 KiB
Plaintext
Executable File
/**
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* Perspective.
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*
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* Move the mouse left and right to change the field of view (fov).
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* Click to modify the aspect ratio. The perspective() function
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* sets a perspective projection applying foreshortening, making
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* distant objects appear smaller than closer ones. The parameters
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* define a viewing volume with the shape of truncated pyramid.
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* Objects near to the front of the volume appear their actual size,
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* while farther objects appear smaller. This projection simulates
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* the perspective of the world more accurately than orthographic projection.
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* The version of perspective without parameters sets the default
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* perspective and the version with four parameters allows the programmer
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* to set the area precisely.
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*/
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void setup() {
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size(640, 360, P3D);
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noStroke();
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}
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void draw() {
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lights();
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background(204);
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float cameraY = height/2.0;
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float fov = mouseX/float(width) * PI/2;
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float cameraZ = cameraY / tan(fov / 2.0);
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float aspect = float(width)/float(height);
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if (mousePressed) {
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aspect = aspect / 2.0;
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}
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perspective(fov, aspect, cameraZ/10.0, cameraZ*10.0);
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translate(width/2+30, height/2, 0);
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rotateX(-PI/6);
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rotateY(PI/3 + mouseY/float(height) * PI);
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box(45);
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translate(0, 0, -50);
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box(30);
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}
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