/// <summary>
/// return a depth buffer texture from given camera, only render "Opaque" renderType objects
/// </summary>
public static Texture2D CreateDepthBuffer(Camera cam)
{
RenderTexture rt = RenderTexture.GetTemporary(Screen.width, Screen.height, 24, RenderTextureFormat.ARGB32);
if (cam == null)
{
cam = Camera.main;
}
var oldClearFlags = cam.clearFlags;
cam.clearFlags = CameraClearFlags.SolidColor;
var oldClearColor = cam.backgroundColor;
cam.backgroundColor = new Color32(254, 254, 254, 254);
Shader shader = GetRenderDepthShader();
cam.targetTexture = rt;
cam.RenderWithShader(shader, ReplacementTag);
cam.targetTexture = null;
Texture2D tex = RTUtil.GetRTPixels(rt);
RenderTexture.ReleaseTemporary(rt);
cam.clearFlags = oldClearFlags;
cam.backgroundColor = oldClearColor;
//byte[] img = tex.EncodeToJPG();
//System.IO.File.WriteAllBytes("Assets/depthBuffer.jpg", img);
//Dbg.Log("write to depthBuffer: {0}, {1}x{2}", tex.GetInstanceID(), tex.width, tex.height);
return(tex);
}