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74 lines
2.8 KiB
74 lines
2.8 KiB
using System;
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using UnityEngine;
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namespace UnityEditor.VFX.Operator
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{
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[VFXHelpURL("Operator-LookAT")]
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[VFXInfo(category = "Math/Vector")]
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class LookAt : VFXOperator
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{
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public class InputProperties
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{
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[Tooltip("The eye position.")]
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public Position from = new Position() { position = Vector3.zero };
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[Tooltip("The target position.")]
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public Position to = new Position() { position = Vector3.one };
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[Normalize, Tooltip("The up vector.")]
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public DirectionType up = Vector3.up;
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}
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public class OutputProperties
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{
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public Transform o = Transform.defaultValue;
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}
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public override string name => "Look At";
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protected override VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
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{
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VFXExpression from = inputExpression[0];
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VFXExpression to = inputExpression[1];
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VFXExpression up = inputExpression[2];
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VFXExpression viewVector = to - from;
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VFXExpression z = VFXOperatorUtility.Normalize(viewVector);
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VFXExpression x = VFXOperatorUtility.Normalize(VFXOperatorUtility.Cross(up, z));
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VFXExpression y = VFXOperatorUtility.Cross(z, x);
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VFXExpression matrix = new VFXExpressionAxisToMatrix(x, y, z, from);
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return new[] { matrix };
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}
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internal sealed override void GenerateErrors(VFXErrorReporter report)
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{
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var context = new VFXExpression.Context(VFXExpressionContextOption.ConstantFolding);
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var fromExpr = GetInputSlot(0).GetExpression();
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var toExpr = GetInputSlot(1).GetExpression();
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var upExpr = GetInputSlot(2).GetExpression();
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context.RegisterExpression(fromExpr);
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context.RegisterExpression(toExpr);
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context.RegisterExpression(upExpr);
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context.Compile();
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if (context.GetReduced(fromExpr) is { } from && from.Is(VFXExpression.Flags.Constant) &&
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context.GetReduced(toExpr) is { } to && to.Is(VFXExpression.Flags.Constant))
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{
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if ((from.Get<Vector3>() - to.Get<Vector3>()).sqrMagnitude < Mathf.Epsilon)
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{
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report.RegisterError("LookAtFromEqualTo", VFXErrorType.Error, "From and To positions cannot be equal", this);
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}
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}
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if (context.GetReduced(upExpr) is { } up && up.Is(VFXExpression.Flags.Constant))
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{
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var sqrLength = up.Get<Vector3>().sqrMagnitude;
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if (sqrLength is 0 or float.NaN)
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{
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report.RegisterError("LookAtUpIsZeroLength", VFXErrorType.Error, "Up vector cannot be zero length", this);
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}
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}
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}
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}
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}
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