VFXExpression AngleFadeSimplification(VFXExpression angleFadeExp)
{
angleFadeExp = angleFadeExp / VFXValue.Constant(new Vector2(180.0f, 180.0f));
var angleStart = new VFXExpressionExtractComponent(angleFadeExp, 0);
var angleEnd = new VFXExpressionExtractComponent(angleFadeExp, 1);
var range = new VFXExpressionMax(VFXValue.Constant(0.0001f), angleEnd - angleStart);
var simplifiedAngleFade = new VFXExpressionCombine(
VFXValue.Constant(1.0f) - (VFXValue.Constant(0.25f) - angleStart) / range,
VFXValue.Constant(-0.25f) / range);
return(simplifiedAngleFade);
}
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 ProcessExpressionMinMax()
{
var a = -1.5f;
var b = 0.2f;
var resultA = Mathf.Min(a, b);
var resultB = Mathf.Max(a, b);
var value_a = new VFXValue <float>(a);
var value_b = new VFXValue <float>(b);
var expressionA = new VFXExpressionMin(value_a, value_b);
var expressionB = new VFXExpressionMax(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>());
Assert.Greater(resultExpressionB.Get <float>(), resultExpressionA.Get <float>());
}
