#210 Morph Targets instatiation

specification/2.0/README.md

@@ -776,6 +776,28 @@ The joint hierarchy used in animation is simply the glTF node hierarchy, with ea
 
 For more details of vertex skinning, refer to [glTF Overview](figures/gltfOverview-0.2.0.png).
 
+#### Morph Targets Instances
+
+A Morph Target is instanced within a node using:
+- The Morph Target referenced in the `mesh` property.
+- The Morph Target `weights` overriding the `weights` of the Morph Target referenced in the `mesh` property.
+The example below instatiates a Morph Target together with a Skin.
+
+```json
+{
+    "nodes": [
+        {
+            "mesh": 11,
+            "skeletons": [
+                21
+            ],
+            "skin": 0,
+            "weights": [0 0.5]
+        }
+    ]
+}
+```
+
 #### Textures
 
 All textures are stored in the asset's `textures` array. A texture is defined by an image file, denoted by the `source` property; `format` and `internalFormat` specifiers, corresponding to the GL texture format types; a `target` type for the sampler; a sampler identifier (`sampler`), and a `type` property defining the internal data format. Refer to the GL definition of `texImage2D()` for more details.

specification/2.0/schema/node.schema.json

@@ -2,7 +2,7 @@
     "$schema" : "http://json-schema.org/draft-04/schema",
     "title" : "node",
     "type" : "object",
-    "description" : "A node in the node hierarchy.  A node can have either the `camera`, `meshes`, or `skeletons`/`skin`/`meshes` properties defined.  In the later case, all `primitives` in the referenced `meshes` contain `JOINT` and `WEIGHT` attributes and the referenced `material`/`technique` from each `primitive` has parameters with `JOINT` and `WEIGHT` semantics.  A node can have either a `matrix` or any combination of `translation`/`rotation`/`scale` (TRS) properties. TRS properties are converted to matrices and postmultiplied in the `T * R * S` order to compose the transformation matrix; first the scale is applied to the vertices, then the rotation, and then the translation. If none are provided, the transform is the identity. When a node is targeted for animation (referenced by an animation.channel.target), only TRS properties may be present; `matrix` will not be present.",
+    "description" : "A node in the node hierarchy.  A node can have either the `camera`, `mesh`, or `skeletons`/`skin`/`mesh` properties defined.  In the later case, all `primitives` in the referenced `mesh` contain `JOINT` and `WEIGHT` attributes and the referenced `material`/`technique` from each `primitive` has parameters with `JOINT` and `WEIGHT` semantics.  A node can have either a `matrix` or any combination of `translation`/`rotation`/`scale` (TRS) properties. TRS properties are converted to matrices and postmultiplied in the `T * R * S` order to compose the transformation matrix; first the scale is applied to the vertices, then the rotation, and then the translation. If none are provided, the transform is the identity. When a node is targeted for animation (referenced by an animation.channel.target), only TRS properties may be present; `matrix` will not be present.",
     "allOf" : [ { "$ref" : "glTFChildOfRootProperty.schema.json" } ],
     "properties" : {
         "camera" : {
@@ -81,13 +81,22 @@
             "maxItems" : 3,
             "default" : [ 0.0, 0.0, 0.0 ]
         },
+        "weights" : {
+            "type" : "array",
+            "description" : "The weights of the instantiated Morph Target",
+            "items" : {
+                "type": "number"
+            },
+            "default" : []
+        },
         "name" : {},
         "extensions" : {},
         "extras" : {}
     },
     "dependencies" : {
-        "skeletons" : ["skin", "meshes"],
-        "skin" : ["skeletons", "meshes"]
+        "skeletons" : ["skin", "mesh"],
+        "skin" : ["skeletons", "mesh"],
+        "weights": ["mesh"],
     },
     "additionalProperties" : false
 }