Fix bones issues with ShaderMaterial

dist/preview release/babylon.max.js

@@ -40502,6 +40502,9 @@ var BABYLON;
                 defines.push("#define NUM_BONE_INFLUENCERS " + mesh.numBoneInfluencers);
                 defines.push("#define BonesPerMesh " + (mesh.skeleton.bones.length + 1));
                 fallbacks.addCPUSkinningFallback(0, mesh);
+                if (this._options.uniforms.indexOf("mBones") === -1) {
+                    this._options.uniforms.push("mBones");
+                }
             }
             else {
                 defines.push("#define NUM_BONE_INFLUENCERS 0");

src/Materials/babylon.shaderMaterial.ts

@@ -205,6 +205,11 @@
                 defines.push("#define NUM_BONE_INFLUENCERS " + mesh.numBoneInfluencers);
                 defines.push("#define BonesPerMesh " + (mesh.skeleton.bones.length + 1));
                 fallbacks.addCPUSkinningFallback(0, mesh);
+
+                if (this._options.uniforms.indexOf("mBones") === -1) {
+                    this._options.uniforms.push("mBones");
+                }
+
             } else {
                 defines.push("#define NUM_BONE_INFLUENCERS 0");
             }