Implement extension KHR_animation_pointer

Runtime/Scripts/AccessorData.cs

@@ -38,7 +38,8 @@ enum AccessorUsage
         Rotation = 1 << 11,
         Scale = 1 << 12,
         Weight = 1 << 13,
-        RequiredForInstantiation = 1 << 14
+        RequiredForInstantiation = 1 << 14,
+        Pointer = 1 << 15,
     }
 
     abstract class AccessorDataBase

Runtime/Scripts/AnimationCameraGameObject.cs

@@ -0,0 +1,74 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace GLTFast {
+    public class AnimationCameraGameObject : MonoBehaviour {
+        public Camera targetCamera;
+        public bool orthographic;
+        public float localScale;
+
+        public float nearClipPlane;
+        float nearClipPlaneOld;
+        public float farClipPlane;
+        float farClipPlaneOld;
+
+        public float xMag;
+        public float yMag;
+        float xMagOld;
+        float yMagOld;
+
+        public float fov;
+        float fovOld;
+
+        void OnEnable() {
+            if (targetCamera == null) {
+                Debug.LogError("Target camera not set on animated camera!");
+            }
+        }
+
+        void LateUpdate() {
+            bool orthoChanged = false;
+            if(farClipPlane != farClipPlaneOld) {
+                if(orthographic) {
+                    orthoChanged = true;
+                    farClipPlane = farClipPlane >= 0 ? farClipPlane : float.MaxValue;
+                }
+                targetCamera.farClipPlane = localScale * farClipPlane;
+                farClipPlaneOld = farClipPlane;
+            }
+
+            if(nearClipPlane != nearClipPlaneOld) {
+                targetCamera.nearClipPlane = localScale * nearClipPlane;
+                nearClipPlaneOld = nearClipPlane;
+                orthoChanged = true;
+            }
+
+            if(xMag != xMagOld) {
+                xMagOld = xMag;
+                orthoChanged = true;
+            }
+
+            if(yMag != yMagOld) {
+                yMagOld = yMag;
+                orthoChanged = true;
+            }
+
+            if(fov != fovOld) {
+                targetCamera.fieldOfView = fov * Mathf.Rad2Deg;
+                fovOld = fov;
+            }
+
+            if(orthographic && orthoChanged) {
+                targetCamera.projectionMatrix = Matrix4x4.Ortho(
+                    -xMag,
+                    xMag,
+                    -yMag,
+                    yMag,
+                    nearClipPlane,
+                    farClipPlane
+                );
+            }
+        }
+    }
+}

Runtime/Scripts/Extensions.cs

@@ -57,6 +57,10 @@ public enum Extension
         /// <see href="https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Khronos/KHR_texture_transform/README.md">KHR_texture_transform</see> glTF extension
         /// </summary>
         TextureTransform,
+        /// <summary>
+        /// <see href="https://github.com/ux3d/glTF/blob/extensions/KHR_animation_pointer/extensions/2.0/Khronos/KHR_animation_pointer/README.md">KHR_texture_transform</see> glTF extension
+        /// </summary>
+        AnimationPointer
     }
 
     /// <summary>
@@ -104,6 +108,10 @@ public static class ExtensionName
         /// <see href="https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_lights_punctual">KHR_lights_punctual</see> glTF extension
         /// </summary>
         public const string LightsPunctual = "KHR_lights_punctual";
+        /// <summary>
+        /// <see href="https://github.com/ux3d/glTF/blob/extensions/KHR_animation_pointer/extensions/2.0/Khronos/KHR_animation_pointer/README.md">KHR_texture_transform</see> glTF extension
+        /// </summary>
+        public const string AnimationPointer = "KHR_animation_pointer";
 
         /// <summary>
         /// Returns the official name of the glTF extension
@@ -114,6 +122,8 @@ public static string GetName(this Extension extension)
         {
             switch (extension)
             {
+                case Extension.AnimationPointer:
+                    return AnimationPointer;
                 case Extension.DracoMeshCompression:
                     return DracoMeshCompression;
                 case Extension.LightsPunctual:

Runtime/Scripts/GameObjectInstantiator.cs

@@ -394,6 +394,16 @@ string cameraName
             cam.nearClipPlane = nearClipPlane * localScale;
             cam.farClipPlane = farClipPlane * localScale;
 
+#if UNITY_ANIMATION
+            var camAnim = cam.transform.parent.gameObject.AddComponent<AnimationCameraGameObject>();
+            camAnim.orthographic = false;
+            camAnim.localScale = localScale;
+            camAnim.targetCamera = cam;
+            camAnim.fov = cam.fieldOfView;
+            camAnim.nearClipPlane = nearClipPlane;
+            camAnim.farClipPlane = farClipPlane;
+#endif
+
             // // If the aspect ratio is given and does not match the
             // // screen's aspect ratio, the viewport rect is reduced
             // // to match the glTFs aspect ratio (box fit)
@@ -431,6 +441,17 @@ string cameraName
                 farValue
             );
 
+#if UNITY_ANIMATION
+            var camAnim = cam.transform.parent.gameObject.AddComponent<AnimationCameraGameObject>();
+            camAnim.orthographic = true;
+            camAnim.localScale = localScale;
+            camAnim.targetCamera = cam;
+            camAnim.xMag = horizontal;
+            camAnim.yMag = vertical;
+            camAnim.nearClipPlane = nearClipPlane;
+            camAnim.farClipPlane = farValue;
+#endif
+
             // // If the aspect ratio does not match the
             // // screen's aspect ratio, the viewport rect is reduced
             // // to match the glTFs aspect ratio (box fit)