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Index › Programming Questions & Help › Syntax Questions › Opengl syntax

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Opengl syntax (Read 1805 times)

andrewowaun

Opengl syntax
May 27^th, 2010, 7:41am

Can someone post the processing syntax for the following opengl ?

glClearColor (0.0, 0.0, 0.0, 0.0);
glClear (GL_COLOR_BUFFER_BIT);
glColor3f (1.0, 1.0, 1.0);
glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
glBegin(GL_POLYGON);
glVertex3f (0.25, 0.25, 0.0);
glVertex3f (0.75, 0.25, 0.0);
glVertex3f (0.75, 0.75, 0.0);
glVertex3f (0.25, 0.75, 0.0);
glEnd();
glFlush();

Smitty

Re: Opengl syntax
Reply #1 - May 27^th, 2010, 8:46am

andrewowaun wrote on May 27^th, 2010, 7:41am:

Can someone post the processing syntax for the following opengl

I feel like this should work, but for some reason it just gives an empty black window:
Code:

void setup() {
  size(300, 300, P3D);
  colorMode(RGB, 1.0);
}

void draw() {
  ortho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);

  background(0.0, 0.0, 0.0);
  
  stroke(1.0, 1.0, 1.0);
  fill(1.0, 1.0, 1.0);
  beginShape();
  vertex(0.25, 0.25, 0.0);
  vertex(0.75, 0.25, 0.0);
  vertex(0.75, 0.75, 0.0);
  vertex(0.25, 0.75, 0.0);
  endShape(CLOSE);
  
}

Smitty Junior Member Offline Posts: 97	Re: Opengl syntax Reply #2 - May 27^th, 2010, 8:58am Also, the reference page for ortho() shows an example. I can't tell why that example works but the sketch I posted doesn't, but maybe it'll help you.

blindfish

Re: Opengl syntax
Reply #3 - May 27^th, 2010, 9:46am

Well the vertex coordinates are pretty close together. Making them further apart, using the default parameters for ortho() and translating (as per the example) at least gets something to render onscreen:

Code:

void setup() {
  size(300, 300, P3D);
  colorMode(RGB, 1.0);
}

void draw() {
  //ortho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
  ortho();
  background(0.0, 0.0, 0.0);
  
  stroke(1.0, 1.0, 1.0);
  fill(1.0, 1.0, 1.0);
  translate(300,300);
  beginShape();
    vertex(25, 25, 0.0);
    vertex(75, 25, 0.0);
    vertex(75, 75, 0.0);
    vertex(25, 75, 0.0);
  endShape(CLOSE);
  
}

Where is the what if the what is in why?

koogy God Member Offline Posts: 788	Re: Opengl syntax Reply #4 - May 27^th, 2010, 2:15pm http://processing.org/discourse/yabb2/num_1274971310.html#1 > Well the vertex coordinates are pretty close together. that depends on where the camera is.

blindfish God Member Offline Posts: 793	Re: Opengl syntax Reply #5 - May 27^th, 2010, 2:25pm I probably have my stupid hat on today...
	Where is the what if the what is in why?

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