/// <summary>
/// Update projections
/// </summary>
private void UpdateLens()
{
if (this.mode == CameraModes.Ortho)
{
this.Projection = Matrix.OrthoLH(
this.viewportWidth,
this.viewportHeight,
this.nearPlaneDistance,
this.farPlaneDistance);
}
else
{
this.Projection = Matrix.PerspectiveFovLH(
this.fieldOfView,
this.aspectRelation,
this.nearPlaneDistance,
this.farPlaneDistance);
}
}
/// <summary>
/// Updates the matrix set
/// </summary>
/// <param name="camera">Camera</param>
/// <param name="lightDirection">Light direction</param>
public void Update(Camera camera, Vector3 lightDirection)
{
// Find the view matrix
lightPosition = camera.Position + camera.Direction * cascadeTotalRange * 0.5f;
Vector3 lookAt = lightPosition + (lightDirection) * camera.FarPlaneDistance;
Vector3 up = Vector3.Normalize(Vector3.Cross(lightDirection, Vector3.Left));
Matrix shadowView = Matrix.LookAtLH(lightPosition, lookAt, up);
// Get the bounds for the shadow space
ExtractFrustumBoundSphere(
camera,
cascadeRanges.First(),
cascadeRanges.Last(),
out BoundingSphere boundingSphere);
// Expand the radius to compensate for numerical errors
shadowBoundRadius = Math.Max(shadowBoundRadius, boundingSphere.Radius);
// Find the projection matrix
Matrix shadowProj = Matrix.OrthoLH(
shadowBoundRadius,
shadowBoundRadius,
-shadowBoundRadius,
shadowBoundRadius);
// The combined transformation from world to shadow space
worldToShadowSpace = shadowView * shadowProj;
toCascadeOffsetX = Vector4.Zero;
toCascadeOffsetY = Vector4.Zero;
toCascadeScale = Vector4.Zero;
if (this.AntiFlicker)
{
UpdateAntiFlicker(camera, shadowView);
}
else
{
UpdateSimple(camera);
}
}