Default Perspective

Programming Questions

elamda

in Programming Questions • 2 years ago

Hello All,

According to the Processing documentation:

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));

But when I plug in the values for perspective and call it explicitly, my view looks different than if I called perspective() with no parameters.

Perhaps I am misreading the docs, but shouldn't perspective() and perspective(params) as stated above produce the same view? I'm using the OPENGL renderer.

Cheers.

Replies(1)

amnon.owed

Re: Default Perspective

2 years ago

Elaborate, cause when I test it, the view looks exactly the same (as expected). See code example below...

import processing.opengl.*;
boolean persp;
void setup() {
size(500,500,OPENGL);
}
void draw() {
if (persp) {
background(0);
perspective();
} else {
background(255,0,0);
float cameraZ = (height/2.0) / tan(PI*60.0/360.0);
perspective(PI/3.0, width/height, cameraZ/10.0, cameraZ*10.0);
}
translate(width/2,height/2,300);
rotateX(radians(45));
rotateY(radians(frameCount % 360));
box(50);
}
void mousePressed() {
persp = !persp;
}