public static CameraMatricesExpressions GetMatricesExpressions(IEnumerable <VFXNamedExpression> expressions, VFXCoordinateSpace cameraSpace, VFXCoordinateSpace outputSpace)
{
var fov = expressions.First(e => e.name == "Camera_fieldOfView");
var aspect = expressions.First(e => e.name == "Camera_aspectRatio");
var near = expressions.First(e => e.name == "Camera_nearPlane");
var far = expressions.First(e => e.name == "Camera_farPlane");
var cameraMatrix = expressions.First(e => e.name == "Camera_transform");
VFXExpression ViewToVFX = cameraMatrix.exp;
if (cameraSpace == VFXCoordinateSpace.World && outputSpace == VFXCoordinateSpace.Local)
{
ViewToVFX = new VFXExpressionTransformMatrix(VFXBuiltInExpression.WorldToLocal, cameraMatrix.exp);
}
else if (cameraSpace == VFXCoordinateSpace.Local && outputSpace == VFXCoordinateSpace.World)
{
ViewToVFX = new VFXExpressionTransformMatrix(VFXBuiltInExpression.LocalToWorld, cameraMatrix.exp);
}
VFXExpression VFXToView = new VFXExpressionInverseTRSMatrix(ViewToVFX);
VFXExpression ViewToClip = VFXOperatorUtility.GetPerspectiveMatrix(fov.exp, aspect.exp, near.exp, far.exp);
VFXExpression ClipToView = new VFXExpressionInverseMatrix(ViewToClip);
return(new CameraMatricesExpressions()
{
ViewToVFX = new VFXNamedExpression(ViewToVFX, "ViewToVFX"),
VFXToView = new VFXNamedExpression(VFXToView, "VFXToView"),
ViewToClip = new VFXNamedExpression(ViewToClip, "ViewToClip"),
ClipToView = new VFXNamedExpression(ClipToView, "ClipToView"),
});
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression inverseTRS = new VFXExpressionInverseTRSMatrix(inputExpression[1]);
VFXExpression scale = new VFXExpressionExtractScaleFromMatrix(inputExpression[1]);
VFXExpression uvw = new VFXExpressionTransformPosition(inverseTRS, inputExpression[2]) + VFXValue.Constant(new Vector3(0.5f, 0.5f, 0.5f));
VFXExpression distanceExpr = new VFXExpressionSampleSDF(inputExpression[0], uvw, scale, inputExpression[3]);
VFXExpression directionExpr = new VFXExpressionSampleSDFNormal(inputExpression[0], inverseTRS, uvw, inputExpression[3]) * VFXValue.Constant(new Vector3(-1.0f, -1.0f, -1.0f));
return(new[] { distanceExpr, directionExpr });
}
public static CameraMatricesExpressions GetMatricesExpressions(IEnumerable <VFXNamedExpression> expressions)
{
var fov = expressions.First(e => e.name == "Camera_fieldOfView");
var aspect = expressions.First(e => e.name == "Camera_aspectRatio");
var near = expressions.First(e => e.name == "Camera_nearPlane");
var far = expressions.First(e => e.name == "Camera_farPlane");
var cameraMatrix = expressions.First(e => e.name == "Camera_transform");
VFXExpression ViewToVFX = cameraMatrix.exp;
VFXExpression VFXToView = new VFXExpressionInverseTRSMatrix(ViewToVFX);
VFXExpression ViewToClip = VFXOperatorUtility.GetPerspectiveMatrix(fov.exp, aspect.exp, near.exp, far.exp);
VFXExpression ClipToView = new VFXExpressionInverseMatrix(ViewToClip);
return(new CameraMatricesExpressions()
{
ViewToVFX = new VFXNamedExpression(ViewToVFX, "ViewToVFX"),
VFXToView = new VFXNamedExpression(VFXToView, "VFXToView"),
ViewToClip = new VFXNamedExpression(ViewToClip, "ViewToClip"),
ClipToView = new VFXNamedExpression(ClipToView, "ClipToView"),
});
}
