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A workaround to get model scaling into StereoKit
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| public class Program | |
| { | |
| private static void Main(string[] _) | |
| { | |
| // Initialize StereoKit | |
| SKSettings settings = new() | |
| { | |
| appName = "ModelScaleSK", | |
| assetsFolder = "Assets", | |
| }; | |
| if (!SK.Initialize(settings)) | |
| { | |
| Environment.Exit(1); | |
| } | |
| Material volumeMat = Default.MaterialUIBox.Copy(); | |
| volumeMat["border_size"] = 0.0f; | |
| volumeMat["border_affect_radius"] = 0.3f; | |
| var model = Model.FromMesh(Mesh.GenerateSphere(15 * U.cm), Material.Default); | |
| float modelScale = 1; | |
| Pose modelPose = new(Input.Head.ToMatrix().Transform(Vec3.Forward * 0.3f), Quat.Identity); | |
| SK.Run(() => | |
| { | |
| Bounds modelBoundsScaled = model.Bounds * modelScale; | |
| if (UIExtension.HandleBegin($"Test", ref modelPose, modelBoundsScaled, ref modelScale)) | |
| { | |
| Default.MeshCube.Draw(volumeMat, Matrix.TS(modelBoundsScaled.center, modelBoundsScaled.dimensions)); | |
| } | |
| UI.HandleEnd(); | |
| Hierarchy.Push(modelPose.ToMatrix(modelScale)); | |
| model.Draw(Matrix.Identity); | |
| Hierarchy.Pop(); | |
| }); | |
| } | |
| /// <summary> | |
| /// Extends StereoKit UI capabilities. | |
| /// </summary> | |
| public static class UIExtension | |
| { | |
| /// <summary> | |
| /// Temporary dictionary to store scale information of the model being scaled by the user. | |
| /// </summary> | |
| private static readonly Dictionary<string, float> s_IdScalePairs = new(); | |
| /// <summary> | |
| /// A modification of UI.HandleBegin, that allows for scaling 3D models through | |
| /// hand interaction. | |
| /// </summary> | |
| /// <param name="id">Name of the 3d model being manipulated.</param> | |
| /// <param name="pose">Pose of the object being manipulated.</param> | |
| /// <param name="handle">Bounds of the object being manipulated.</param> | |
| /// <param name="scale">Current scale of the object.</param> | |
| /// <param name="drawHandle">Flag to indicate whether to draw the bounds.</param> | |
| /// <param name="moveType">Defines how the handle follows the user's hands.</param> | |
| /// <returns>The original result from StereoKit's HandleBegin.</returns> | |
| public static bool HandleBegin(string id, ref Pose pose, Bounds handle, ref float scale, | |
| bool drawHandle = false, UIMove moveType = UIMove.Exact) | |
| { | |
| if (UI.HandleBegin(id, ref pose, handle, drawHandle, moveType)) | |
| { | |
| if (moveType != UIMove.Exact) | |
| { | |
| return true; | |
| } | |
| Hand leftHand = Input.Hand(Handed.Left); | |
| Hand rightHand = Input.Hand(Handed.Right); | |
| if (leftHand.IsTracked && rightHand.IsTracked | |
| && leftHand.IsPinched && rightHand.IsPinched) | |
| { | |
| if (leftHand.IsJustPinched || rightHand.IsJustPinched) | |
| { | |
| handle.center = pose.ToMatrix().Transform(handle.center); | |
| if (handle.Contains(leftHand.pinchPt) && handle.Contains(rightHand.pinchPt)) | |
| { | |
| s_IdScalePairs[id] = Vec3.Distance(leftHand.pinchPt, rightHand.pinchPt) / scale; | |
| } | |
| } | |
| else if (s_IdScalePairs.ContainsKey(id)) | |
| { | |
| float currentDist = Vec3.Distance(leftHand.pinchPt, rightHand.pinchPt); | |
| scale = currentDist / s_IdScalePairs[id]; | |
| } | |
| } | |
| else if (s_IdScalePairs.ContainsKey(id)) | |
| { | |
| s_IdScalePairs.Remove(id); | |
| } | |
| return true; | |
| } | |
| if (s_IdScalePairs.ContainsKey(id)) | |
| { | |
| s_IdScalePairs.Remove(id); | |
| } | |
| return false; | |
| } | |
| public static bool Handle(string id, ref Pose pose, Bounds handle, ref float scale, | |
| bool drawHandle = false, UIMove moveType = UIMove.Exact) | |
| { | |
| bool result = HandleBegin(id, ref pose, handle, ref scale, drawHandle, moveType); | |
| UI.HandleEnd(); | |
| return result; | |
| } | |
| } | |
| } |
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