private void Update(Scene scene, Camera camera)
{
// set GL state for depth map
GL.ClearColor(1, 1, 1, 1);
GL.Disable(EnableCap.Blend);
GL.Enable(EnableCap.CullFace);
GL.FrontFace(FrontFaceDirection.Ccw);
GL.CullFace(renderer.shadowMapCullFace);
renderer.DepthTest = true;
var lights = new List <Light>();
// preprocess lights
// - skip lights that are not casting shadows
// - create virtual lights for cascaded shadow maps
foreach (var light in scene.lights)
{
if (!light.DoesCastShadow)
{
continue;
}
var shadowLight = light as HasShadow;
if (shadowLight != null && shadowLight.ShadowCascade)
{
for (var n = 0; n < shadowLight.ShadowCascadeCount; n++)
{
VirtualLight virtualLight;
if (shadowLight.ShadowCascadeArray[n] == null)
{
virtualLight = CreateVirtualLight(light, n);
virtualLight.OriginalCamera = camera;
var gyro = new Gyroscope();
gyro.Position = shadowLight.ShadowCascadeOffset;
gyro.Add(virtualLight);
//gyro.Add(virtualLight.Target);
camera.Add(gyro);
shadowLight.ShadowCascadeArray[n] = virtualLight;
Debug.WriteLine("Created virtualLight {0}", virtualLight);
}
else
{
virtualLight = shadowLight.ShadowCascadeArray[n];
}
UpdateVirtualLight(light, n);
lights.Add(virtualLight);
}
}
else
{
lights.Add(light);
}
}
// render depth map
foreach (var light in lights)
{
var hasShadow = light as HasShadow;
if (hasShadow.shadowMap == null)
{
var isSoftShadow = renderer.shadowMapType == ShadowType.PCFSoftShadowMap;
hasShadow.shadowMap = new RenderTarget(hasShadow.ShadowMapWidth, hasShadow.ShadowMapHeight);
hasShadow.shadowMap.MinFilter = isSoftShadow ? TextureMinFilter.Nearest : TextureMinFilter.Linear;
hasShadow.shadowMap.MagFilter = isSoftShadow ? TextureMagFilter.Nearest : TextureMagFilter.Linear;;
hasShadow.shadowMap.Format = Three.Net.Renderers.PixelFormat.RGBA;
hasShadow.ShadowMapSize = new Vector2(hasShadow.ShadowMapWidth, hasShadow.ShadowMapHeight);
hasShadow.ShadowMatrix = Matrix4.Identity;
}
if (hasShadow.ShadowCamera == null)
{
if (hasShadow is SpotLight)
{
hasShadow.ShadowCamera = new PerspectiveCamera(renderer, hasShadow.ShadowCameraFov, hasShadow.ShadowCameraNear, hasShadow.ShadowCameraFar);
}
else if (hasShadow is DirectionalLight)
{
hasShadow.ShadowCamera = new OrthographicCamera(hasShadow.ShadowCameraLeft, hasShadow.ShadowCameraRight, hasShadow.ShadowCameraTop, hasShadow.ShadowCameraBottom, hasShadow.ShadowCameraNear, hasShadow.ShadowCameraFar);
}
else
{
throw new Exception("Unsupported light type for shadow");
}
scene.Add(hasShadow.ShadowCamera);
if (scene.AutoUpdate)
{
scene.UpdateMatrixWorld();
}
}
if (hasShadow.ShadowCameraVisible /* && light.CameraHelper == null*/)
{
throw new NotImplementedException();
//light.CameraHelper = new CameraHelper( hasShadow.ShadowCamera );
//hasShadow.ShadowCamera.Add( light.CameraHelper );
}
var virtualLight = light as VirtualLight;
if (virtualLight != null && virtualLight.OriginalCamera == camera)
{
UpdateShadowCamera(camera, light);
}
var shadowMap = hasShadow.shadowMap;
var shadowMatrix = hasShadow.ShadowMatrix;
var shadowCamera = hasShadow.ShadowCamera;
shadowCamera.Position = Vector3.FromPosition(light.matrixWorld);
matrixPosition = (light as HasTarget).Target;
shadowCamera.LookAt(matrixPosition);
shadowCamera.UpdateMatrixWorld();
shadowCamera.matrixWorldInverse = Matrix4.GetInverse(shadowCamera.matrixWorld);
//TODO : Creating helpers if ( light.cameraHelper ) light.cameraHelper.visible = light.shadowCameraVisible;
//if (hasShadow.ShadowCameraVisible) light.cameraHelper.update();
// compute shadow matrix
shadowMatrix = new Matrix4(0.5f, 0.0f, 0.0f, 0.5f,
0.0f, 0.5f, 0.0f, 0.5f,
0.0f, 0.0f, 0.5f, 0.5f,
0.0f, 0.0f, 0.0f, 1.0f);
shadowMatrix.Multiply(shadowCamera.projectionMatrix);
shadowMatrix.Multiply(shadowCamera.matrixWorldInverse);
// update camera matrices and frustum
projectionScreenMatrix.MultiplyMatrices(shadowCamera.projectionMatrix, shadowCamera.matrixWorldInverse);
frustum = Frustum.FromMatrix(projectionScreenMatrix);
// render shadow map
renderer.SetRenderTarget(shadowMap);
renderer.Clear();
// set object matrices & frustum culling
renderList.Clear();
ProjectObject(scene, scene, shadowCamera);
// render regular objects
foreach (var glObject in renderList)
{
var o = glObject.Object;
var buffer = glObject.Buffer;
throw new NotImplementedException();
}
}
// restore GL state
var clearColor = renderer.ClearColor;
GL.ClearColor(clearColor.R, clearColor.G, clearColor.B, 1);
GL.Enable(EnableCap.Blend);
if (renderer.shadowMapCullFace == CullFaceMode.Front)
{
GL.CullFace(CullFaceMode.Back);
}
}