protected void RenderWithShadows(CascadedShadowMap shadowMap, Matrix view, Matrix projection, Light light, RendererParameters instance)
{
DrawGeometry(view, projection, new object[] { shadowMap, light }, mWithShadowsConfigurer, instance);
}
protected void RenderWithoutShadows(Matrix view, Matrix projection, Light light, RendererParameters instance)
{
DrawGeometry(view, projection, new object[] { light }, mWithoutShadowsConfigurer, instance);
}
public void GenerateCascades(ICamera camera, Light light, BoundingBox sceneAABB)
{
mLightView = Matrix.CreateLookAt(camera.Position, camera.Position + light.Direction, Vector3.Up);
Vector3[] sceneCorners = sceneAABB.GetCorners();
Vector3.Transform(sceneCorners, ref mLightView, sceneCorners);
BoundingBox lightSpaceSceneAABB = BoundingBox.CreateFromPoints(sceneCorners);
float maxCameraDistance = camera.FarPlaneDistance - camera.NearPlaneDistance;
Vector3 cameraPosition = Vector3.Transform(camera.Position, mLightView);
for (int iCascadeCount = 0; iCascadeCount < mCascadeCount; iCascadeCount++)
{
Cascade cascade = mCascadeContainer[iCascadeCount];
if (iCascadeCount == mCascadeCount - 1)
{
cascade.ProjectionTransform = Matrix.CreateOrthographicOffCenter(
lightSpaceSceneAABB.Min.X,
lightSpaceSceneAABB.Max.X,
lightSpaceSceneAABB.Min.Y,
lightSpaceSceneAABB.Max.Y,
-lightSpaceSceneAABB.Max.Z,
-lightSpaceSceneAABB.Min.Z
);
}
else
{
float farCascadeDistance = maxCameraDistance * cascade.FarPlanePercentage;
Matrix frustumProjection = Matrix.CreatePerspectiveFieldOfView(
camera.FieldOfView,
camera.AspectRatio,
camera.NearPlaneDistance,
camera.NearPlaneDistance + farCascadeDistance
);
Vector3[] frustumCorners = new BoundingFrustum(camera.View * frustumProjection).GetCorners();
Vector3.Transform(frustumCorners, ref mLightView, frustumCorners);
BoundingBox frustumBounds = BoundingBox.CreateFromPoints(frustumCorners);
cascade.ProjectionTransform = Matrix.CreateOrthographicOffCenter(
frustumBounds.Min.X,
frustumBounds.Max.X,
frustumBounds.Min.Y,
frustumBounds.Max.Y,
-lightSpaceSceneAABB.Max.Z,
-lightSpaceSceneAABB.Min.Z
);
}
int tileX = iCascadeCount % 2;
int tileY = iCascadeCount / 2;
float bufferBorder = 3.0f / (float)mCascadeResolution;
cascade.BufferBounds = new Vector4(
0.5f * tileX + bufferBorder,
0.5f * tileX + 0.5f - bufferBorder,
0.5f * tileY + bufferBorder,
0.5f * tileY + 0.5f - bufferBorder
);
Matrix tileTransform = Matrix.Identity;
tileTransform.M11 = 0.25f;
tileTransform.M22 = -0.25f;
tileTransform.Translation = new Vector3(0.25f + tileX * 0.5f, 0.25f + tileY * 0.5f, 0);
cascade.TileTransform = tileTransform;
}
}
public void RenderAllInstancesWithShadows(CascadedShadowMap shadowMap, Matrix view, Matrix projection, Light light)
{
if (mWithShadowsConfigurer != null)
{
foreach (RendererParameters instance in mInstances)
{
RenderWithShadows(shadowMap, view, projection, light, instance);
}
}
}
/// <summary>
/// Instantiates scene light sources and shadow manager.
/// </summary>
private static void CreateLightsAndShadows()
{
mDirectionalLight = new Light(
Vector3.Normalize(new Vector3(0.4233333f, 1.0f, -0.5533332f)), // Direction
Vector3.Zero, // Gaze
new Vector3(0.05333332f, 0.09882354f, 0.1819608f), // Ambient Color
new Vector3(1, 0.9607844f, 0.8078432f), // Diffuse Color
new Vector3(1, 0.9607844f, 0.8078432f) // Specular Color
);
mShadowMap = new CascadedShadowMap(mDevice, 2048);
}
