protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression lineDelta = (inputExpression[1] - inputExpression[0]);
VFXExpression lineLength = new VFXExpressionMax(VFXOperatorUtility.Dot(lineDelta, lineDelta), VFXValue.Constant(Mathf.Epsilon));
VFXExpression t = VFXOperatorUtility.Dot(inputExpression[2] - inputExpression[0], lineDelta);
t = VFXOperatorUtility.Clamp(t / lineLength, VFXValue.Constant(0.0f), VFXValue.Constant(1.0f));
VFXExpression pointOnLine = (inputExpression[0] + VFXOperatorUtility.CastFloat(t, lineDelta.valueType) * lineDelta);
VFXExpression lineDistance = VFXOperatorUtility.Distance(inputExpression[2], pointOnLine);
return(new VFXExpression[] { pointOnLine, lineDistance });
}
public void ProcessOperatorDistance()
{
var a = new Vector3(0.2f, 0.3f, 0.4f);
var b = new Vector3(1.0f, 2.3f, 5.4f);
var resultA = Vector3.Distance(a, b);
var resultB = Vector3.Dot(a - b, a - b);
var value_a = new VFXValue <Vector3>(a);
var value_b = new VFXValue <Vector3>(b);
var expressionA = VFXOperatorUtility.Distance(value_a, value_b);
var expressionB = VFXOperatorUtility.SqrDistance(value_a, value_b);
var context = new VFXExpression.Context(VFXExpressionContextOption.CPUEvaluation);
var resultExpressionA = context.Compile(expressionA);
var resultExpressionB = context.Compile(expressionB);
Assert.AreEqual(resultA, resultExpressionA.Get <float>());
Assert.AreEqual(resultB, resultExpressionB.Get <float>());
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
return(new[] { VFXOperatorUtility.Distance(inputExpression[0], inputExpression[1]) });
}
