mode | 要绘制的图元:可以是 TRIANGLES、TRIANGLE_STRIP、QUADS 或 LINES。 |
开始绘制 3D 图元。
在 OpenGL 中,这与 glBegin
相匹配;在其他图形 API 中,会模拟相同的功能。在 GL.Begin 和 GL.End 之间,可以调用 GL.Vertex、GL.Color、GL.TexCoord 和其他立即模式绘制函数。
在自行绘制图元时,应注意剔除。剔除规则可能因游戏运行的图形 API 而异。在大多数情况下,最安全的方法是在着色器中使用 Cull Off
命令。
其他资源:GL.End。
using UnityEngine;
public class Example : MonoBehaviour { // Draws a Triangle, a Quad and a line // with different colors
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.TRIANGLES); // Triangle GL.Color(new Color(1, 1, 1, 1)); GL.Vertex3(0.50f, 0.25f, 0); GL.Vertex3(0.25f, 0.25f, 0); GL.Vertex3(0.375f, 0.5f, 0); GL.End();
GL.Begin(GL.QUADS); // Quad GL.Color(new Color(0.5f, 0.5f, 0.5f, 1)); GL.Vertex3(0.5f, 0.5f, 0); GL.Vertex3(0.5f, 0.75f, 0); GL.Vertex3(0.75f, 0.75f, 0); GL.Vertex3(0.75f, 0.5f, 0); GL.End();
GL.Begin(GL.LINES); // Line GL.Color(new Color(0, 0, 0, 1)); GL.Vertex3(0, 0, 0); GL.Vertex3(0.75f, 0.75f, 0); GL.End(); GL.PopMatrix(); } }
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