wehub-resource-sync
62 lines
2.2 KiB
C#
62 lines
2.2 KiB
C#
namespace Lib.render.analyze;
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[Guid("56779460-e3e2-401b-8836-f11917b55431")]
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internal sealed class GetScreenPos : Instance<GetScreenPos>
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{
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[Output(Guid = "caf0c601-8462-4f33-8983-f860214e4f24")]
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public readonly Slot<Command> UpdateCommand = new();
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[Output(Guid = "b0cfdbbd-e07a-411d-9095-b774a9dd80dd")]
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public readonly Slot<Vector3> Position = new();
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public GetScreenPos()
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{
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UpdateCommand.UpdateAction += Update;
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}
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private void Update(EvaluationContext context)
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{
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var worldPosition = LocalPosition.GetValue(context);
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// 1. World to View Space
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var worldPositionHomogeneous = new Vector4(worldPosition, 1.0f);
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var viewPosition = Vector4.Transform(worldPositionHomogeneous, context.ObjectToWorld * context.WorldToCamera);
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// 2. View to Clip Space
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var clipPosition = Vector4.Transform(viewPosition, context.CameraToClipSpace);
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// 3. Perspective Division
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var ndcPosition = new Vector3(
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clipPosition.X / clipPosition.W,
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clipPosition.Y / clipPosition.W,
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clipPosition.Z / clipPosition.W
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);
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// 4. Viewport Transformation to your desired range
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var aspectRatio = context.CameraToClipSpace.M22 / context.CameraToClipSpace.M11;
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var screenX = ndcPosition.X * aspectRatio;
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var screenY = ndcPosition.Y;
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var screenZ = SetDepthToZero.GetValue(context)
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? 0f
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: ndcPosition.Z;
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var screenPosition = new Vector3(screenX, screenY, screenZ);
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var changed = Vector3.Distance(screenPosition, _lastPosition) > 0.0001f;
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if (changed)
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{
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_lastPosition = screenPosition;
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Position.Value = screenPosition;
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Position.DirtyFlag.ForceInvalidate();
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}
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}
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private Vector3 _lastPosition;
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[Input(Guid = "B597DC38-72BB-4929-B939-C33247EF98EB")]
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public readonly InputSlot<Vector3> LocalPosition = new();
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[Input(Guid = "9E55A7AD-2CF0-414A-8D7B-7D7C63B9FBB2")]
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public readonly InputSlot<bool> SetDepthToZero = new();
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} |