Begin 的模式:绘制三角形带。
从开头到末尾,在经过的每个顶点之间绘制三角形。如果经过 5 个顶点,A、B、C、D 和 E,则绘制 3 个三角形。在前 3 个顶点之间绘制第一个三角形。所有后续三角形均使用之前的 2 个顶点,再加下一个额外顶点。在该示例中,绘制的三个三角形将为 A、B、C,然后是 B、C、D,最后是 C、D、E。
要为 2D 模式绘制设置屏幕,则使用 GL.LoadOrtho 或 GL.LoadPixelMatrix。
要为 3D 模式绘制设置屏幕,则使用 GL.LoadIdentity,然后使用具有所需变换矩阵的 GL.MultMatrix。
另请参阅:GL.Begin、GL.End。
using UnityEngine;
public class Example : MonoBehaviour { // Draws 2 triangles in the left side of the screen // that look like a square
Material mat;
void OnPostRender() { if (!mat) { Debug.LogError("Please Assign a material on the inspector"); return; } GL.PushMatrix(); mat.SetPass(0); GL.LoadOrtho(); GL.Begin(GL.TRIANGLE_STRIP); GL.Color(new Color(0, 0, 0, 1)); GL.Vertex3(0.25f, 0.5f, 0); GL.Vertex3(0, 0.5f, 0); GL.Vertex3(0.25f, 0.25f, 0); GL.Vertex3(0, 0.25f, 0); GL.End(); GL.PopMatrix(); } }
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