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Index › Programming Questions & Help › OpenGL and 3D Libraries › Texture map in OPENGL

Xeon_SX YaBB Newbies Offline Posts: 2	Texture map in OPENGL Mar 19th, 2006, 12:17pm   It works in P3D but doesnt in OPENGL, why and what to do? import processing.opengl.*; PImage im; int L=100; void setup(){ size(500,500,P3D); im=loadImage("fish.jpg"); stroke(255); } void draw(){ background(0); translate(356,256,0); beginShape(); texture(im); vertex(0,0,1); vertex(-L,0,1); vertex(-L,L,1); vertex(0,L,1); endShape(); }

SAITO YaBB Newbies Offline Posts: 22 Los Angeles

Re: Texture map in OPENGL Reply #1 - Apr 14th, 2006, 4:28pm   Yea. I noticed this issue when I tried to run .obj loader on recent versions of Processing. I am not sure why yet. Please let me know if anybody knows why. Xeon_SX wrote on Mar 19th, 2006, 12:17pm: It works in P3D but doesnt in OPENGL, why and what to do import processing.opengl.*; PImage im; int L=100; void setup(){ size(500,500,P3D); im=loadImage("fish.jpg"); stroke(255); } void draw(){ background(0); translate(356,256,0); beginShape(); texture(im); vertex(0,0,1); vertex(-L,0,1); vertex(-L,L,1); vertex(0,L,1); endShape(); }

SAITO / tatsuyas@ucla.edu

JohnG Ex Member

Re: Texture map in OPENGL Reply #2 - Apr 14th, 2006, 4:40pm   You need to tell OpenGL what part of the texture maps to each vertex, and that you want it to use QUADS. So you want: Code: beginShape(QUADS); texture(im); vertex(0,0,1,0,0); vertex(-L,0,1,im.width,0); vertex(-L,L,1,im.width,im.height); vertex(0,L,1,0,im.height); endShape(); You may need to change the last 2 numbers around a bit as the image may be inverted or flipped.