Helper function to set up an ortho perspective transform.
After calling LoadOrtho, the viewing frustum goes from (0,0,-1) to (1,1,100).
LoadOrtho can be used for drawing primitives in 2D.
using UnityEngine;
public class Example : MonoBehaviour { // Draws a triangle over an already drawn triangle Material mat;
void OnPostRender() { if (!mat) { Debug.LogError("Please Assign a material on the inspector"); return; } GL.PushMatrix(); mat.SetPass(0); GL.LoadOrtho(); GL.Color(Color.red); GL.Begin(GL.TRIANGLES); GL.Vertex3(0.25f, 0.1351f, 0); GL.Vertex3(0.25f, 0.3f, 0); GL.Vertex3(0.5f, 0.3f, 0); GL.End();
GL.Color(Color.yellow); GL.Begin(GL.TRIANGLES); GL.Vertex3(0.5f, 0.25f, -1); GL.Vertex3(0.5f, 0.1351f, -1); GL.Vertex3(0.1f, 0.25f, -1); GL.End();
GL.PopMatrix(); } }
See Also: GL.LoadProjectionMatrix.
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