solve issue #1932 (class cast exceptions in FBX importer) (#1934)

Author: stephengold

jme3-plugins/src/fbx/java/com/jme3/scene/plugins/fbx/anim/FbxBindPose.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2021 jMonkeyEngine
+ * Copyright (c) 2009-2023 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -62,18 +62,43 @@ public void fromElement(FbxElement element) {
                 if (e.id.equals("Node")) {
                     node = FbxId.create(e.properties.get(0));
                 } else if (e.id.equals("Matrix")) {
-                    double[] matDataDoubles = (double[]) e.properties.get(0);
-                    
-                    if (matDataDoubles.length != 16) {
-                        // corrupt
-                        throw new UnsupportedOperationException("Bind pose matrix "
-                                + "must have 16 doubles, but it has " 
-                                + matDataDoubles.length + ". Data is corrupt");
-                    }
-                    
                     matData = new float[16];
-                    for (int i = 0; i < matDataDoubles.length; i++) {
-                        matData[i] = (float) matDataDoubles[i];
+                    int numProperties = e.propertiesTypes.length;
+                    if (numProperties == 1) {
+                        char propertyType = e.propertiesTypes[0];
+                        if (propertyType != 'd') {
+                            throw new UnsupportedOperationException(
+                                    "Bind-pose matrix should have property type 'd',"
+                                    + "but found '" + propertyType + "'");
+                        }
+                        double[] array = (double[]) e.properties.get(0);
+                        int length = array.length;
+                        if (length != 16) {
+                            throw new UnsupportedOperationException(
+                                    "Bind-pose matrix should have 16 elements,"
+                                    + "but found " + length);
+                        }
+                        for (int i = 0; i < length; ++i) {
+                            matData[i] = (float) array[i];
+                        }
+
+                    } else if (numProperties == 16) {
+                        for (int i = 0; i < numProperties; ++i) {
+                            char propertyType = e.propertiesTypes[i];
+                            if (propertyType != 'D') {
+                                throw new UnsupportedOperationException(
+                                        "Bind-pose matrix should have properties of type 'D',"
+                                        + "but found '" + propertyType + "'");
+                            }
+                            double d = (Double) e.properties.get(i);
+                            matData[i] = (float) d;
+                        }
+
+                    } else {
+                        throw new UnsupportedOperationException(
+                                "Bind pose matrix should have either "
+                                + "1 or 16 properties, but found "
+                                + numProperties);
                     }
                 }
             }

jme3-plugins/src/fbx/java/com/jme3/scene/plugins/fbx/anim/FbxCluster.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2015 jMonkeyEngine
+ * Copyright (c) 2009-2023 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -54,9 +54,43 @@ public void fromElement(FbxElement element) {
         super.fromElement(element);
         for (FbxElement e : element.children) {
             if (e.id.equals("Indexes")) {
-                indexes = (int[]) e.properties.get(0);
+                int numProperties = e.propertiesTypes.length;
+                if (numProperties == 1 && e.propertiesTypes[0] == 'i') {
+                    this.indexes = (int[]) e.properties.get(0);
+
+                } else {
+                    this.indexes = new int[numProperties];
+                    for (int i = 0; i < numProperties; ++i) {
+                        char propertyType = e.propertiesTypes[i];
+                        if (propertyType != 'I') {
+                            throw new UnsupportedOperationException(
+                                    "Indexes should have properties of type 'I',"
+                                    + "but found '" + propertyType + "'");
+                        }
+                        int index = (Integer) e.properties.get(i);
+                        this.indexes[i] = index;
+                    }
+                }
+
             } else if (e.id.equals("Weights")) {
-                weights = (double[]) e.properties.get(0);
+                int numTypes = e.propertiesTypes.length;
+                if (numTypes == 1 && e.propertiesTypes[0] == 'd') {
+                    this.weights = (double[]) e.properties.get(0);
+
+                } else {
+                    int numElements = numTypes;
+                    this.weights = new double[numElements];
+                    for (int i = 0; i < numElements; ++i) {
+                        int propertyType = e.propertiesTypes[i];
+                        if (propertyType != 'D') {
+                            throw new UnsupportedOperationException(
+                                    "Weights should have properties of type 'D',"
+                                    + "but found '" + propertyType + "'");
+                        }
+                        double weight = (Double) e.properties.get(i);
+                        this.weights[i] = weight;
+                    }
+                }
             }
         }
     }