protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var expressions = Block.CameraHelper.AddCameraExpressions(GetExpressionsFromSlots(this), camera);
// camera matrix is already in world even in custom mode due to GetOutputSpaceFromSlot returning world space
Block.CameraMatricesExpressions matricesExpressions = Block.CameraHelper.GetMatricesExpressions(expressions, VFXCoordinateSpace.World, VFXCoordinateSpace.World);
// result = position * VFXToView * ViewToClip
VFXExpression positionExpression = inputExpression[0];
VFXExpression viewPosExpression = new VFXExpressionTransformPosition(matricesExpressions.VFXToView.exp, positionExpression);
VFXExpression clipPosExpression = new VFXExpressionTransformVector4(matricesExpressions.ViewToClip.exp, VFXOperatorUtility.CastFloat(viewPosExpression, VFXValueType.Float4, 1.0f));
// normalize using w component and renormalize to range [0, 1]
VFXExpression halfExpression = VFXValue.Constant(0.5f);
VFXExpression normalizedExpression = new VFXExpressionCombine(new VFXExpression[]
{
(clipPosExpression.x / clipPosExpression.w) * halfExpression + halfExpression,
(clipPosExpression.y / clipPosExpression.w) * halfExpression + halfExpression,
viewPosExpression.z // The z position is in world units from the camera
});
return(new VFXExpression[]
{
normalizedExpression
});
}
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 void ProcessExpressionTransformPosition()
{
var t = new Vector3(0.2f, 0.3f, 0.4f);
var m = new Matrix4x4();
m.SetTRS(new Vector3(1.0f, 2.0f, 3.0f), Quaternion.Euler(0.2f, 0.3f, 0.4f), new Vector3(2.0f, 3.0f, 4.0f));
var result = m.MultiplyPoint(t);
var value_t = new VFXValue <Vector3>(t);
var value_m = new VFXValue <Matrix4x4>(m);
var expression = new VFXExpressionTransformPosition(value_m, value_t);
var context = new VFXExpression.Context(VFXExpressionContextOption.CPUEvaluation);
var resultExpression = context.Compile(expression);
Assert.AreEqual(result, resultExpression.Get <Vector3>());
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var expressions = Block.CameraHelper.AddCameraExpressions(GetExpressionsFromSlots(this), camera);
// camera matrix is already in world even in custom mode due to GetOutputSpaceFromSlot returning world space
Block.CameraMatricesExpressions matricesExpressions = Block.CameraHelper.GetMatricesExpressions(expressions, VFXCoordinateSpace.World, VFXCoordinateSpace.World);
// renormalize XY from viewport position [0, 1] to clip position [-1, 1]
VFXExpression viewportPosExpression = inputExpression[0];
VFXExpression oneExpression = VFXValue.Constant(1.0f);
VFXExpression twoExpression = VFXValue.Constant(2.0f);
VFXExpression clipPosExpression = new VFXExpressionCombine(viewportPosExpression.x * twoExpression - oneExpression, viewportPosExpression.y * twoExpression - oneExpression, oneExpression, oneExpression);
// result = clipPos * ClipToView * ViewToVFX
VFXExpression viewPosExpression = new VFXExpressionTransformVector4(matricesExpressions.ClipToView.exp, clipPosExpression);
viewPosExpression = new VFXExpressionCombine(viewPosExpression.x, viewPosExpression.y, viewPosExpression.z) * viewportPosExpression.zzz;
VFXExpression positionExpression = new VFXExpressionTransformPosition(matricesExpressions.ViewToVFX.exp, viewPosExpression);
return(new VFXExpression[]
{
positionExpression
});
}
