Name 
perspective() 
Examples 
# Recreates the default perspective
size(100, 100, P3D)
noFill()
fov = PI / 3.0
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 

Updated on Tue Jul 11 06:52:24 2017.