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Closeバックフェースかリングを反転させるかどうかを選択する
Unlike most other calls, this is not only related to stuff you draw via GL class. It changes culling of triangles globally. Major use case: rendering reflections for mirrors, water etc. Since virtual camera for rendering the reflection is mirrored, the culling order has to be inverted. You can see that the Water script in Pro Standard Assets does that.
// Draws 2 yellow triangles and makes them appear/dissapear // depending on the vertex draw order // Notice that everything on the scene will suffer from the revert // backfacing as well var mat : Material; var swap : boolean = false; function Update() { if(Input.GetKeyDown(KeyCode.Space)) { if(swap) { swap = false; } else { swap = true; } } } function OnPostRender() { if (!mat) { Debug.LogError("Please Assign a material on the inspector"); return; } GL.PushMatrix(); mat.SetPass(0); GL.LoadOrtho(); GL.Color(Color.yellow); GL.Begin(GL.TRIANGLES); GL.SetRevertBackfacing(swap); GL.Vertex3(0,0,0); GL.Vertex3(1,1,0); GL.Vertex3(0,1,0); GL.Vertex3(0,0,0); GL.Vertex3(1,1,0); GL.Vertex3(1,0,0); GL.End(); GL.PopMatrix(); }
using UnityEngine; using System.Collections; public class ExampleClass : MonoBehaviour { public Material mat; public bool swap = false; void Update() { if (Input.GetKeyDown(KeyCode.Space)) if (swap) swap = false; else swap = true; } void OnPostRender() { if (!mat) { Debug.LogError("Please Assign a material on the inspector"); return; } GL.PushMatrix(); mat.SetPass(0); GL.LoadOrtho(); GL.Color(Color.yellow); GL.Begin(GL.TRIANGLES); GL.SetRevertBackfacing(swap); GL.Vertex3(0, 0, 0); GL.Vertex3(1, 1, 0); GL.Vertex3(0, 1, 0); GL.Vertex3(0, 0, 0); GL.Vertex3(1, 1, 0); GL.Vertex3(1, 0, 0); GL.End(); GL.PopMatrix(); } }
import UnityEngine import System.Collections public class ExampleClass(MonoBehaviour): public mat as Material public swap as bool = false def Update() as void: if Input.GetKeyDown(KeyCode.Space): if swap: swap = false else: swap = true def OnPostRender() as void: if not mat: Debug.LogError('Please Assign a material on the inspector') return GL.PushMatrix() mat.SetPass(0) GL.LoadOrtho() GL.Color(Color.yellow) GL.Begin(GL.TRIANGLES) GL.SetRevertBackfacing(swap) GL.Vertex3(0, 0, 0) GL.Vertex3(1, 1, 0) GL.Vertex3(0, 1, 0) GL.Vertex3(0, 0, 0) GL.Vertex3(1, 1, 0) GL.Vertex3(1, 0, 0) GL.End() GL.PopMatrix()