Hi
I'm having a go at making a turn-the-page album. I've managed to turn one page; code below. When the turning "page" is facing me edge on, the perspective is unnaturally exaggerated. I think the solution is to push the vanishing point much further away.
Playing with the z value of translate (together with the image size) does not fix it.
Any ideas?
Thanks
string


Code:

//originated from
//TexturedCube by Dave Bollinger
PImage square1;
float rotY = 0.0;

void setup()
{
  size(400, 200, P3D);
  noStroke();
  
  square1 = loadImage("square01.jpg");
  textureMode(NORMALIZED);
}

void draw()
{
  background(255);
  
  translate(width/2, height/2, -100);
  rotateY(rotY);
  picturePage(square1);
}

void picturePage(PImage square1)
{
  beginShape(QUADS);
  texture(square1);  
  vertex(0, -100, 0, 0, 0);
  vertex(200, -100, 0, 1, 0);
  vertex(200, 100, 0, 1, 1);
  vertex(0, 100, 0, 0, 1);
  endShape();
}

void mouseMoved() 
{
  rotY = map(mouseX, 0, width, -PI, 0);
}
 

your quad gets very close to the camera eye, thus the exaggerated perspective.

a simple fix would be to arbitrarily squash z by adding something like scale(1,1,.5) right after translate(), then tune the ".5" to your liking

a more "correct" approach would be to push it further back in the scene (like translate z to -1000), then reduce the field of view with perspective().  analagous to a real camera with a telephoto lens on a distant object, will "flatten" perspective