babylonjs [SOLVED] Update imported mesh positions for morphing

[pichayuth]

Hi,

I have imported mesh from Blender which is basic box.

I want to update mesh vertices positions each time I click the mesh, so I will get a random new shape from the imported mesh. (modify the existing mesh to get new one)

this is the import mesh code 

 var m
    BABYLON.SceneLoader.ImportMesh('', 'mesh/Box/', 'Box.babylon', scene, function (meshes, particleSystems) {
        m = meshes[0];
        m.isVisible = true;
        var temp = m.getVerticesData(BABYLON.VertexBuffer.PositionKind);
        var count = 0;
        for (var i = 0; i < temp.length / 3; i++) {
            var arr = BABYLON.Vector3.FromArray(temp, count);
            count += 3;
            console.log(arr);
        }
    })

Each time I click, I try to change its color first and it worked and call updateMeshPositions. after calling updateMeshPositions, I log out the new positions and all positions is already changed, but the mesh look the same.

var positionFunction = function (positions) {
        for (var i = 0; i < positions.length; i++) {
            if (i % 2 === 0)
                positions *= 2;
            if (i % 3 === 0)
                positions *= 4;
        }
    };

    scene.onPointerDown = function (evt, pick) {
        if (pick.pickedMesh) {
            var material = new BABYLON.StandardMaterial('mat1', scene);
            material.emissiveColor = new BABYLON.Color3(0, 1, 0);
            pick.pickedMesh.material = material;

            m.updateMeshPositions(positionFunction, true);
            temp = m.getVerticesData(BABYLON.VertexBuffer.PositionKind);
            console.log(temp);
        }
    };

I don't understand that although the positions is changed but the mesh look the same.

Thank you, every one in advance

Peace.

[jerome]

Your mesh must be set as updatable.

[JCPalmer]

yep, but problem may be that coming from a .babylon that is always set to non-updateable.  For my source code generator for Blender, I only generate update-able geometry source code when there are Blender shapekeys on the mesh.

Perhaps, get the geometry, then do another setVerticesData().  This time setting last arg to true.

[pichayuth]

thank you jerome and JCPalmer

On 2/15/2017 at 11:03 PM, JCPalmer said:

Perhaps, get the geometry, then do another setVerticesData().  This time setting last arg to true.

did you mean after loading the mesh in, I crate new Geometry by using the mesh .getVerticesData(BABYLON.VertexBuffer.PositionKind) and set updatable to true, am i understand it right? 

[JCPalmer]

yep. Checking, .babylon files can set geometry to updateable (FYI, incremental hardcoded as un-updateable).  Not sure what exporters support this other than BJS serializer (Blender does not right now).  Check with your exporter source.

Assuming it does not, doing a new setVerticesData() from the results of a getVerticesData() would seem to be required.

[pichayuth]

Thank you JCPalmer

I will take a look at .babylon and maybe exporter, but what I have done now is, I called updateMeshPositions to update the vertices and get those vertices and setVerticesData.
The mesh is changed, but I don't know if this is the best way to update it.

            m.updateMeshPositions(positionFunction, true);
            var temp = m.getVerticesData(BABYLON.VertexBuffer.PositionKind);
            m.setVerticesData(BABYLON.VertexBuffer.PositionKind, temp, true);