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Name 
perspective() 
Examples  // Recreates the default perspective
size(100, 100, P3D);
noFill();
float fov = PI/3.0;
float cameraZ = (height/2.0) / tan(fov/2.0);
perspective(fov, float(width)/float(height),
cameraZ/10.0, cameraZ*10.0);
translate(50, 50, 0);
rotateX(PI/6);
rotateY(PI/3);
box(45);

Description 
Sets a perspective projection applying foreshortening, making distant objects appear smaller than closer ones. The parameters define a viewing volume with the shape of truncated pyramid. Objects near to the front of the volume appear their actual size, while farther objects appear smaller. This projection simulates the perspective of the world more accurately than orthographic projection. The version of perspective without parameters sets the default perspective and the version with four parameters allows the programmer to set the area precisely. The default values are: perspective(PI/3.0, width/height, cameraZ/10.0, cameraZ*10.0) where cameraZ is ((height/2.0) / tan(PI*60.0/360.0));

Syntax  perspective()
perspective(fovy, aspect, zNear, zFar) 
Parameters 
fovy 
float: fieldofview angle (in radians) for vertical direction 
aspect 
float: ratio of width to height 
zNear 
float: zposition of nearest clipping plane 
zFar 
float: zposition of farthest clipping plane 

Returns  void 
Updated on October 2, 2018 05:02:09pm EDT