Examples with GLTFAccessor org.terasology.engine.rendering.gltf.model.GLTFAccessor used on opensource projects

Example 6 with GLTFAccessor

use of org.terasology.engine.rendering.gltf.model.GLTFAccessor in project Terasology by MovingBlocks.

the class GLTFSkeletalMeshFormat method load.

@Override
public SkeletalMeshData load(ResourceUrn urn, List<AssetDataFile> inputs) throws IOException {
    try (Reader in = new InputStreamReader(inputs.get(0).openStream())) {
        GLTF gltf = gson.fromJson(in, GLTF.class);
        checkVersionSupported(urn, gltf);
        checkMeshPresent(urn, gltf);
        GLTFSkin skin = gltf.getSkins().get(0);
        GLTFMesh gltfMesh = gltf.getMeshes().get(0);
        checkPrimitivePresent(urn, gltfMesh);
        GLTFPrimitive gltfPrimitive = gltfMesh.getPrimitives().get(0);
        List<byte[]> loadedBuffers = loadBinaryBuffers(urn, gltf);
        SkeletalMeshDataBuilder builder = new SkeletalMeshDataBuilder();
        List<Bone> bones = loadBones(gltf, skin, loadedBuffers);
        for (Bone bone : bones) {
            builder.addBone(bone);
        }
        List<Vector3f> positions = loadVector3fList(MeshAttributeSemantic.Position, gltfPrimitive, gltf, loadedBuffers);
        List<Vector3f> normals = loadVector3fList(MeshAttributeSemantic.Normal, gltfPrimitive, gltf, loadedBuffers);
        TIntList joints = readIntBuffer(MeshAttributeSemantic.Joints_0, gltfPrimitive, gltf, loadedBuffers);
        TFloatList weights = readFloatBuffer(MeshAttributeSemantic.Weights_0, gltfPrimitive, gltf, loadedBuffers);
        List<BoneWeight> boneWeights = new ArrayList<>();
        for (int index = 0; index < positions.size(); index++) {
            TIntList weightJoints = new TIntArrayList();
            TFloatList weightBiases = new TFloatArrayList();
            for (int i = 0; i < 4; i++) {
                if (weights.get(4 * index + i) > 0) {
                    weightBiases.add(weights.get(4 * index + i));
                    weightJoints.add(joints.get(4 * index + i));
                }
            }
            boneWeights.add(new BoneWeight(weightBiases, weightJoints));
        }
        builder.addVertices(positions);
        builder.addNormals(normals);
        builder.addWeights(boneWeights);
        builder.setUvs(loadVector2fList(MeshAttributeSemantic.Texcoord_0, gltfPrimitive, gltf, loadedBuffers));
        GLTFAccessor indicesAccessor = getIndicesAccessor(gltfPrimitive, gltf, urn);
        if (indicesAccessor.getBufferView() == null) {
            throw new IOException("Missing buffer view for indices accessor in " + urn);
        }
        GLTFBufferView indicesBuffer = gltf.getBufferViews().get(indicesAccessor.getBufferView());
        checkIndicesBuffer(indicesBuffer);
        TIntList indicies = new TIntArrayList();
        readBuffer(loadedBuffers.get(indicesBuffer.getBuffer()), indicesAccessor, indicesBuffer, indicies);
        builder.setIndices(indicies);
        if (gltf.getSkins().isEmpty()) {
            throw new IOException("Skeletal mesh '" + urn + "' missing skin");
        }
        return builder.build();
    }
}