Java Code Examples for com.jme3.scene.VertexBuffer#updateData()

protected void morph( VertexBuffer sourcePos, VertexBuffer sourceNorms,
                      VertexBuffer targetPos, VertexBuffer targetNorms ) {
    FloatBuffer sp = (FloatBuffer)sourcePos.getData();
    sp.rewind();

    FloatBuffer sn = (FloatBuffer)sourceNorms.getData();
    sn.rewind();

    FloatBuffer tp = (FloatBuffer)targetPos.getData();
    tp.rewind();

    FloatBuffer tn = (FloatBuffer)targetNorms.getData();
    tn.rewind();

    morph(sp, sn, tp, tn);

    sp.rewind();
    sn.rewind();

    tp.rewind();
    targetPos.updateData(tp);
    tn.rewind();
    targetNorms.updateData(tn);
}
 

/**
 * The method updates the geometry according to the poitions of the bones.
 */
public void updateGeometry() {
    VertexBuffer vb = this.getBuffer(Type.Position);
    FloatBuffer posBuf = this.getFloatBuffer(Type.Position);
    posBuf.clear();
    for (int i = 0; i < skeleton.getBoneCount(); ++i) {
        Bone bone = skeleton.getBone(i);
        Vector3f parentTail = bone.getModelSpacePosition().add(bone.getModelSpaceRotation().mult(Vector3f.UNIT_Y.mult(boneLengths.get(i))));

        for (Bone child : bone.getChildren()) {
            Vector3f childHead = child.getModelSpacePosition();
            Vector3f v = childHead.subtract(parentTail);
            float pointDelta = v.length() / POINT_AMOUNT;
            v.normalizeLocal().multLocal(pointDelta);
            Vector3f pointPosition = parentTail.clone();
            for (int j = 0; j < POINT_AMOUNT; ++j) {
                posBuf.put(pointPosition.getX()).put(pointPosition.getY()).put(pointPosition.getZ());
                pointPosition.addLocal(v);
            }
        }
    }
    posBuf.flip();
    vb.updateData(posBuf);

    this.updateBound();
}
 

public void update(Vector3f[] points){
    VertexBuffer vb = getBuffer(Type.Position);
    if (vb == null){
        setBuffer(Type.Position, 3, BufferUtils.createFloatBuffer(points));
        return;
    }

    FloatBuffer b = BufferUtils.createFloatBuffer(points);
    FloatBuffer a = (FloatBuffer) vb.getData();
    b.rewind();
    a.rewind();
    a.put(b);
    a.rewind();

    vb.updateData(a);
    
    updateBound();
}
 

/**
 * The method updates the geometry according to the poitions of the bones.
 */
public void updateGeometry() {
    VertexBuffer vb = this.getBuffer(Type.Position);
    FloatBuffer posBuf = this.getFloatBuffer(Type.Position);
    posBuf.clear();
    for (int i = 0; i < skeleton.getBoneCount(); ++i) {
        Bone bone = skeleton.getBone(i);
        Vector3f head = bone.getModelSpacePosition();

        posBuf.put(head.getX()).put(head.getY()).put(head.getZ());
        if (boneLengths != null) {
            Vector3f tail = head.add(bone.getModelSpaceRotation().mult(Vector3f.UNIT_Y.mult(boneLengths.get(i))));
            posBuf.put(tail.getX()).put(tail.getY()).put(tail.getZ());
        }
    }
    posBuf.flip();
    vb.updateData(posBuf);

    this.updateBound();
}
 

/**
 * Alter the start and end.
 *
 * @param start the desired mesh location of the start (not null,
 * unaffected)
 * @param end the desired mesh location of the end (not null, unaffected)
 */
public void updatePoints(Vector3f start, Vector3f end) {
    this.start.set(start);
    this.end.set(end);

    VertexBuffer posBuf = getBuffer(Type.Position);
    
    FloatBuffer fb = (FloatBuffer) posBuf.getData();
    fb.rewind();
    fb.put(start.x).put(start.y).put(start.z);
    fb.put(end.x).put(end.y).put(end.z);
    
    posBuf.updateData(fb);
    
    updateBound();
}
 

public void update(Vector3f[] points){
    VertexBuffer vb = getBuffer(Type.Position);
    if (vb == null){
        setBuffer(Type.Position, 3, BufferUtils.createFloatBuffer(points));
        return;
    }

    FloatBuffer b = BufferUtils.createFloatBuffer(points);
    FloatBuffer a = (FloatBuffer) vb.getData();
    b.rewind();
    a.rewind();
    a.put(b);
    a.rewind();

    vb.updateData(a);
    
    updateBound();
}
 

private void applyFrame(Mesh target, int frameIndex, float weight){
    PoseFrame frame = frames[frameIndex];
    VertexBuffer pb = target.getBuffer(Type.Position);
    for (int i = 0; i < frame.poses.length; i++){
        Pose pose = frame.poses[i];
        float poseWeight = frame.weights[i] * weight;

        pose.apply(poseWeight, (FloatBuffer) pb.getData());
    }

    // force to re-upload data to gpu
    pb.updateData(pb.getData());
}
 

/**
     * Sets the arrow's extent.
     * This will modify the buffers on the mesh.
     * 
     * @param extent the arrow's extent.
     */
    public void setArrowExtent(Vector3f extent) {
        float len = extent.length();
//        Vector3f dir = extent.normalize();

        tempQuat.lookAt(extent, Vector3f.UNIT_Y);
        tempQuat.normalizeLocal();

        VertexBuffer pvb = getBuffer(Type.Position);
        FloatBuffer buffer = (FloatBuffer)pvb.getData(); 
        buffer.rewind();
        for (int i = 0; i < positions.length; i += 3) {
            Vector3f vec = tempVec.set(positions[i],
                    positions[i + 1],
                    positions[i + 2]);
            vec.multLocal(len);
            tempQuat.mult(vec, vec);

            buffer.put(vec.x);
            buffer.put(vec.y);
            buffer.put(vec.z);
        }
        
        pvb.updateData(buffer);

        updateBound();
        updateCounts();
    }
 

/**
     * Sets the arrow's extent.
     * This will modify the buffers on the mesh.
     * 
     * @param extent the arrow's extent.
     */
    public void setArrowExtent(Vector3f extent) {
        float len = extent.length();
//        Vector3f dir = extent.normalize();

        tempQuat.lookAt(extent, Vector3f.UNIT_Y);
        tempQuat.normalizeLocal();

        VertexBuffer pvb = getBuffer(Type.Position);
        FloatBuffer buffer = (FloatBuffer)pvb.getData(); 
        buffer.rewind();
        for (int i = 0; i < positions.length; i += 3) {
            Vector3f vec = tempVec.set(positions[i],
                    positions[i + 1],
                    positions[i + 2]);
            vec.multLocal(len);
            tempQuat.mult(vec, vec);

            buffer.put(vec.x);
            buffer.put(vec.y);
            buffer.put(vec.z);
        }
        
        pvb.updateData(buffer);

        updateBound();
        updateCounts();
    }
 

public void updateGeometry(){
    VertexBuffer vb = getBuffer(Type.Position);
    FloatBuffer posBuf = getFloatBuffer(Type.Position);
    posBuf.clear();
    for (int i = 0; i < skeleton.getBoneCount(); i++){
        Bone bone = skeleton.getBone(i);
        Vector3f bonePos = bone.getModelSpacePosition();

        posBuf.put(bonePos.getX()).put(bonePos.getY()).put(bonePos.getZ());
    }
    posBuf.flip();
    vb.updateData(posBuf);

    updateBound();
}
 

public void updateGeometry(){
    VertexBuffer vb = getBuffer(Type.Position);
    FloatBuffer posBuf = getFloatBuffer(Type.Position);
    posBuf.clear();
    for (int i = 0; i < skeleton.getBoneCount(); i++){
        Bone bone = skeleton.getBone(i);
        Vector3f bonePos = bone.getModelSpacePosition();

        posBuf.put(bonePos.getX()).put(bonePos.getY()).put(bonePos.getZ());
    }
    posBuf.flip();
    vb.updateData(posBuf);

    updateBound();
}
 

@Override
public void initParticleData(ParticleEmitter emitter, int numParticles) {
    setMode(Mode.Points);

    this.emitter = emitter;

    // set positions
    FloatBuffer pb = BufferUtils.createVector3Buffer(numParticles);
    VertexBuffer pvb = new VertexBuffer(VertexBuffer.Type.Position);
    pvb.setupData(Usage.Stream, 3, Format.Float, pb);
     
    //if the buffer is already set only update the data
    VertexBuffer buf = getBuffer(VertexBuffer.Type.Position);
    if (buf != null) {
        buf.updateData(pb);
    } else {
        setBuffer(pvb);
    }

    // set colors
    ByteBuffer cb = BufferUtils.createByteBuffer(numParticles * 4);
    VertexBuffer cvb = new VertexBuffer(VertexBuffer.Type.Color);
    cvb.setupData(Usage.Stream, 4, Format.UnsignedByte, cb);
    cvb.setNormalized(true);
    
    buf = getBuffer(VertexBuffer.Type.Color);
    if (buf != null) {
        buf.updateData(cb);
    } else {
        setBuffer(cvb);
    }

    // set sizes
    FloatBuffer sb = BufferUtils.createFloatBuffer(numParticles);
    VertexBuffer svb = new VertexBuffer(VertexBuffer.Type.Size);
    svb.setupData(Usage.Stream, 1, Format.Float, sb);
            
    buf = getBuffer(VertexBuffer.Type.Size);
    if (buf != null) {
        buf.updateData(sb);
    } else {
        setBuffer(svb);
    }

    // set UV-scale
    FloatBuffer tb = BufferUtils.createFloatBuffer(numParticles*4);
    VertexBuffer tvb = new VertexBuffer(VertexBuffer.Type.TexCoord);
    tvb.setupData(Usage.Stream, 4, Format.Float, tb);
    
    buf = getBuffer(VertexBuffer.Type.TexCoord);
    if (buf != null) {
        buf.updateData(tb);
    } else {
        setBuffer(tvb);
    }
}
 

@Override
public void initParticleData(ParticleEmitter emitter, int numParticles) {
    setMode(Mode.Triangles);

    this.emitter = emitter;

    particlesCopy = new Particle[numParticles];

    // set positions
    FloatBuffer pb = BufferUtils.createVector3Buffer(numParticles * 4);
    VertexBuffer pvb = new VertexBuffer(VertexBuffer.Type.Position);
    pvb.setupData(Usage.Stream, 3, Format.Float, pb);
    
    //if the buffer is already set only update the data
    VertexBuffer buf = getBuffer(VertexBuffer.Type.Position);
    if (buf != null) {
        buf.updateData(pb);
    } else {
        setBuffer(pvb);
    }
    
    // set colors
    ByteBuffer cb = BufferUtils.createByteBuffer(numParticles * 4 * 4);
    VertexBuffer cvb = new VertexBuffer(VertexBuffer.Type.Color);
    cvb.setupData(Usage.Stream, 4, Format.UnsignedByte, cb);
    cvb.setNormalized(true);
    
    buf = getBuffer(VertexBuffer.Type.Color);
    if (buf != null) {
        buf.updateData(cb);
    } else {
        setBuffer(cvb);
    }

    // set texcoords
    VertexBuffer tvb = new VertexBuffer(VertexBuffer.Type.TexCoord);
    FloatBuffer tb = BufferUtils.createVector2Buffer(numParticles * 4);
    
    uniqueTexCoords = false;
    for (int i = 0; i < numParticles; i++){
        tb.put(0f).put(1f);
        tb.put(1f).put(1f);
        tb.put(0f).put(0f);
        tb.put(1f).put(0f);
    }
    tb.flip();
    tvb.setupData(Usage.Static, 2, Format.Float, tb);
    
    buf = getBuffer(VertexBuffer.Type.TexCoord);
    if (buf != null) {
        buf.updateData(tb);
    } else {
        setBuffer(tvb);
    }

    // set indices
    ShortBuffer ib = BufferUtils.createShortBuffer(numParticles * 6);
    for (int i = 0; i < numParticles; i++){
        int startIdx = (i * 4);

        // triangle 1
        ib.put((short)(startIdx + 1))
          .put((short)(startIdx + 0))
          .put((short)(startIdx + 2));

        // triangle 2
        ib.put((short)(startIdx + 1))
          .put((short)(startIdx + 2))
          .put((short)(startIdx + 3));
    }
    ib.flip();
    
    VertexBuffer ivb = new VertexBuffer(VertexBuffer.Type.Index);
    ivb.setupData(Usage.Static, 3, Format.UnsignedShort, ib);
    
    buf = getBuffer(VertexBuffer.Type.Index);
    if (buf != null) {
        buf.updateData(ib);
    } else {
        setBuffer(ivb);
    }
    
}
 

private void softwareSkinUpdate(Mesh mesh, Matrix4f[] offsetMatrices) {
        int maxWeightsPerVert = mesh.getMaxNumWeights();
        int fourMinusMaxWeights = 4 - maxWeightsPerVert;

        // NOTE: This code assumes the vertex buffer is in bind pose
        // resetToBind() has been called this frame
        VertexBuffer vb = mesh.getBuffer(VertexBuffer.Type.Position);
        FloatBuffer fvb = (FloatBuffer) vb.getData();
        fvb.rewind();

        VertexBuffer nb = mesh.getBuffer(VertexBuffer.Type.Normal);
        FloatBuffer fnb = (FloatBuffer) nb.getData();
        fnb.rewind();

        // get boneIndexes and weights for mesh
        ByteBuffer ib = (ByteBuffer) mesh.getBuffer(VertexBuffer.Type.BoneIndex).getData();
        FloatBuffer wb = (FloatBuffer) mesh.getBuffer(VertexBuffer.Type.BoneWeight).getData();

        ib.rewind();
        wb.rewind();

        float[] weights = wb.array();
        byte[] indices = ib.array();
        int idxWeights = 0;

        TempVars vars = TempVars.get();
        float[] posBuf = vars.skinPositions;
        float[] normBuf = vars.skinNormals;

        int iterations = (int) FastMath.ceil(fvb.capacity() / ((float) posBuf.length));
        int bufLength = posBuf.length * 3;
        for (int i = iterations - 1; i >= 0; i--) {
            // read next set of positions and normals from native buffer
            bufLength = Math.min(posBuf.length, fvb.remaining());
            fvb.get(posBuf, 0, bufLength);
            fnb.get(normBuf, 0, bufLength);
            int verts = bufLength / 3;
            int idxPositions = 0;

            // iterate vertices and apply skinning transform for each effecting bone
            for (int vert = verts - 1; vert >= 0; vert--) {
                float nmx = normBuf[idxPositions];
                float vtx = posBuf[idxPositions++];
                float nmy = normBuf[idxPositions];
                float vty = posBuf[idxPositions++];
                float nmz = normBuf[idxPositions];
                float vtz = posBuf[idxPositions++];

                float rx = 0, ry = 0, rz = 0, rnx = 0, rny = 0, rnz = 0;

                for (int w = maxWeightsPerVert - 1; w >= 0; w--) {
                    float weight = weights[idxWeights];
                    Matrix4f mat = offsetMatrices[indices[idxWeights++]];

                    rx += (mat.m00 * vtx + mat.m01 * vty + mat.m02 * vtz + mat.m03) * weight;
                    ry += (mat.m10 * vtx + mat.m11 * vty + mat.m12 * vtz + mat.m13) * weight;
                    rz += (mat.m20 * vtx + mat.m21 * vty + mat.m22 * vtz + mat.m23) * weight;

                    rnx += (nmx * mat.m00 + nmy * mat.m01 + nmz * mat.m02) * weight;
                    rny += (nmx * mat.m10 + nmy * mat.m11 + nmz * mat.m12) * weight;
                    rnz += (nmx * mat.m20 + nmy * mat.m21 + nmz * mat.m22) * weight;
                }

                idxWeights += fourMinusMaxWeights;

                idxPositions -= 3;
                normBuf[idxPositions] = rnx;
                posBuf[idxPositions++] = rx;
                normBuf[idxPositions] = rny;
                posBuf[idxPositions++] = ry;
                normBuf[idxPositions] = rnz;
                posBuf[idxPositions++] = rz;
            }


            fvb.position(fvb.position() - bufLength);
            fvb.put(posBuf, 0, bufLength);
            fnb.position(fnb.position() - bufLength);
            fnb.put(normBuf, 0, bufLength);
        }

        vb.updateData(fvb);
        nb.updateData(fnb);

//        mesh.updateBound();
    }
 

private VertexBuffer makeLod(Mesh mesh) {
    VertexBuffer indexBuffer = mesh.getBuffer(VertexBuffer.Type.Index);
    
    boolean isShortBuffer = indexBuffer.getFormat() == VertexBuffer.Format.UnsignedShort;
    // Create buffers.
    VertexBuffer lodBuffer = new VertexBuffer(VertexBuffer.Type.Index);
    int bufsize = indexCount == 0 ? 3 : indexCount;
    
    if (isShortBuffer) {
        lodBuffer.setupData(VertexBuffer.Usage.Static, 3, VertexBuffer.Format.UnsignedShort, BufferUtils.createShortBuffer(bufsize));
    } else {
        lodBuffer.setupData(VertexBuffer.Usage.Static, 3, VertexBuffer.Format.UnsignedInt, BufferUtils.createIntBuffer(bufsize));
    }
    
    
    
    lodBuffer.getData().rewind();
    //Check if we should fill it with a "dummy" triangle.
    if (indexCount == 0) {
        if (isShortBuffer) {
            for (int m = 0; m < 3; m++) {
                ((ShortBuffer) lodBuffer.getData()).put((short) 0);
            }
        } else {
            for (int m = 0; m < 3; m++) {
                ((IntBuffer) lodBuffer.getData()).put(0);
            }
        }
    }

    // Fill buffers.       
    Buffer buf = lodBuffer.getData();
    buf.rewind();
    for (Triangle triangle : triangleList) {
        if (!triangle.isRemoved) {
        //    assert (indexCount != 0);
            if (isShortBuffer) {
                for (int m = 0; m < 3; m++) {
                    ((ShortBuffer) buf).put((short) triangle.vertexId[m]);
                    
                }
            } else {
                for (int m = 0; m < 3; m++) {
                    ((IntBuffer) buf).put(triangle.vertexId[m]);
                }
                
            }
        }
    }
    buf.clear();
    lodBuffer.updateData(buf);
    return lodBuffer;
}
 

@Override
    public void initParticleData(ParticleEmitter emitter, int numParticles) {
        setMode(Mode.Triangles);

        this.emitter = emitter;

//        particlesCopy = new Particle[numParticles];

        // set positions
        FloatBuffer pb = BufferUtils.createVector3Buffer(numParticles * 4);
        // if the buffer is already set only update the data
        VertexBuffer buf = getBuffer(VertexBuffer.Type.Position);
        if (buf != null) {
            buf.updateData(pb);
        } else {
            VertexBuffer pvb = new VertexBuffer(VertexBuffer.Type.Position);
            pvb.setupData(Usage.Stream, 3, Format.Float, pb);
            setBuffer(pvb);
        }
        
        // set colors
        ByteBuffer cb = BufferUtils.createByteBuffer(numParticles * 4 * 4);
        buf = getBuffer(VertexBuffer.Type.Color);
        if (buf != null) {
            buf.updateData(cb);
        } else {
            VertexBuffer cvb = new VertexBuffer(VertexBuffer.Type.Color);
            cvb.setupData(Usage.Stream, 4, Format.UnsignedByte, cb);
            cvb.setNormalized(true);
            setBuffer(cvb);
        }

        // set texcoords
        FloatBuffer tb = BufferUtils.createVector2Buffer(numParticles * 4);
        uniqueTexCoords = false;
        for (int i = 0; i < numParticles; i++){
            tb.put(0f).put(1f);
            tb.put(1f).put(1f);
            tb.put(0f).put(0f);
            tb.put(1f).put(0f);
        }
        tb.flip();
        
        buf = getBuffer(VertexBuffer.Type.TexCoord);
        if (buf != null) {
            buf.updateData(tb);
        } else {
            VertexBuffer tvb = new VertexBuffer(VertexBuffer.Type.TexCoord);
            tvb.setupData(Usage.Static, 2, Format.Float, tb);
            setBuffer(tvb);
        }

        // set indices
        ShortBuffer ib = BufferUtils.createShortBuffer(numParticles * 6);
        for (int i = 0; i < numParticles; i++){
            int startIdx = (i * 4);

            // triangle 1
            ib.put((short)(startIdx + 1))
              .put((short)(startIdx + 0))
              .put((short)(startIdx + 2));

            // triangle 2
            ib.put((short)(startIdx + 1))
              .put((short)(startIdx + 2))
              .put((short)(startIdx + 3));
        }
        ib.flip();

        buf = getBuffer(VertexBuffer.Type.Index);
        if (buf != null) {
            buf.updateData(ib);
        } else {
            VertexBuffer ivb = new VertexBuffer(VertexBuffer.Type.Index);
            ivb.setupData(Usage.Static, 3, Format.UnsignedShort, ib);
            setBuffer(ivb);
        }
        
        updateCounts();
    }
 

@Override
public void updateParticleData(Particle[] particles, Camera cam, Matrix3f inverseRotation) {
    VertexBuffer pvb = getBuffer(VertexBuffer.Type.Position);
    FloatBuffer positions = (FloatBuffer) pvb.getData();

    VertexBuffer cvb = getBuffer(VertexBuffer.Type.Color);
    ByteBuffer colors = (ByteBuffer) cvb.getData();

    VertexBuffer svb = getBuffer(VertexBuffer.Type.Size);
    FloatBuffer sizes = (FloatBuffer) svb.getData();

    VertexBuffer tvb = getBuffer(VertexBuffer.Type.TexCoord);
    FloatBuffer texcoords = (FloatBuffer) tvb.getData();

    float sizeScale = emitter.getWorldScale().x;

    // update data in vertex buffers
    positions.rewind();
    colors.rewind();
    sizes.rewind();
    texcoords.rewind();
    for (int i = 0; i < particles.length; i++){
        Particle p = particles[i];
        
        positions.put(p.position.x)
                 .put(p.position.y)
                 .put(p.position.z);

        sizes.put(p.size * sizeScale);
        colors.putInt(p.color.asIntABGR());

        int imgX = p.imageIndex % imagesX;
        int imgY = p.imageIndex/imagesX;

        float startX = ((float) imgX) / imagesX;
        float startY = ((float) imgY) / imagesY;
        float endX   = startX + (1f / imagesX);
        float endY   = startY + (1f / imagesY);

        texcoords.put(startX).put(startY).put(endX).put(endY);
    }
    positions.flip();
    colors.flip();
    sizes.flip();
    texcoords.flip();

    // force renderer to re-send data to GPU
    pvb.updateData(positions);
    cvb.updateData(colors);
    svb.updateData(sizes);
    tvb.updateData(texcoords);
}
 

@Override
public void initParticleData(ParticleEmitter emitter, int numParticles) {
    setMode(Mode.Points);

    this.emitter = emitter;

    // set positions
    FloatBuffer pb = BufferUtils.createVector3Buffer(numParticles);
    
    //if the buffer is already set only update the data
    VertexBuffer buf = getBuffer(VertexBuffer.Type.Position);
    if (buf != null) {
        buf.updateData(pb);
    } else {
        VertexBuffer pvb = new VertexBuffer(VertexBuffer.Type.Position);
        pvb.setupData(Usage.Stream, 3, Format.Float, pb);
        setBuffer(pvb);
    }

    // set colors
    ByteBuffer cb = BufferUtils.createByteBuffer(numParticles * 4);
    
    buf = getBuffer(VertexBuffer.Type.Color);
    if (buf != null) {
        buf.updateData(cb);
    } else {
        VertexBuffer cvb = new VertexBuffer(VertexBuffer.Type.Color);
        cvb.setupData(Usage.Stream, 4, Format.UnsignedByte, cb);
        cvb.setNormalized(true);
        setBuffer(cvb);
    }

    // set sizes
    FloatBuffer sb = BufferUtils.createFloatBuffer(numParticles);
    
    buf = getBuffer(VertexBuffer.Type.Size);
    if (buf != null) {
        buf.updateData(sb);
    } else {
        VertexBuffer svb = new VertexBuffer(VertexBuffer.Type.Size);
        svb.setupData(Usage.Stream, 1, Format.Float, sb);
        setBuffer(svb);
    }

    // set UV-scale
    FloatBuffer tb = BufferUtils.createFloatBuffer(numParticles*4);
    
    buf = getBuffer(VertexBuffer.Type.TexCoord);
    if (buf != null) {
        buf.updateData(tb);
    } else {
        VertexBuffer tvb = new VertexBuffer(VertexBuffer.Type.TexCoord);
        tvb.setupData(Usage.Stream, 4, Format.Float, tb);
        setBuffer(tvb);
    }
    
    updateCounts();
}
 

@Override
public void updateParticleData(Particle[] particles, Camera cam, Matrix3f inverseRotation) {
    VertexBuffer pvb = getBuffer(VertexBuffer.Type.Position);
    FloatBuffer positions = (FloatBuffer) pvb.getData();

    VertexBuffer cvb = getBuffer(VertexBuffer.Type.Color);
    ByteBuffer colors = (ByteBuffer) cvb.getData();

    VertexBuffer svb = getBuffer(VertexBuffer.Type.Size);
    FloatBuffer sizes = (FloatBuffer) svb.getData();

    VertexBuffer tvb = getBuffer(VertexBuffer.Type.TexCoord);
    FloatBuffer texcoords = (FloatBuffer) tvb.getData();

    float sizeScale = emitter.getWorldScale().x;

    // update data in vertex buffers
    positions.rewind();
    colors.rewind();
    sizes.rewind();
    texcoords.rewind();
    for (int i = 0; i < particles.length; i++){
        Particle p = particles[i];
        
        positions.put(p.position.x)
                 .put(p.position.y)
                 .put(p.position.z);

        sizes.put(p.size * sizeScale);
        colors.putInt(p.color.asIntABGR());

        int imgX = p.imageIndex % imagesX;
        int imgY = (p.imageIndex - imgX) / imagesY;

        float startX = ((float) imgX) / imagesX;
        float startY = ((float) imgY) / imagesY;
        float endX   = startX + (1f / imagesX);
        float endY   = startY + (1f / imagesY);

        texcoords.put(startX).put(startY).put(endX).put(endY);
    }
    positions.flip();
    colors.flip();
    sizes.flip();
    texcoords.flip();

    // force renderer to re-send data to GPU
    pvb.updateData(positions);
    cvb.updateData(colors);
    svb.updateData(sizes);
    tvb.updateData(texcoords);
}
 

/**
 * Update the start and end points of the line.
 */
public void updatePoints(Vector3f start, Vector3f end) {
    VertexBuffer posBuf = getBuffer(Type.Position);

    FloatBuffer fb = (FloatBuffer) posBuf.getData();

    fb.put(start.x).put(start.y).put(start.z);
    fb.put(end.x).put(end.y).put(end.z);
    
    posBuf.updateData(fb);
    
    updateBound();
}