How Subdivide polygons like ThreeJS on BabylonJS?

[jorditantadiaz]

Hi, i am trying to subdivide a mesh, after load it by OBJLoader on BabylonJS, but i don't understand how  do  something like this (ThreeJS).

var geometry = new THREE.Geometry().fromBufferGeometry( mesh_.geometry );
var modifier = new THREE.SubdivisionModifier( 3 );
modifier.modify( geometry );
geometry.mergeVertices()
mesh_.geometry = geometry

But on Babylon JS, i could not found documentation about how subdivide polygons after load mesh by OBJLoader

[JohnK]

Hi there and welcome to the forum. Not really sure if this is what you want to do or not but maybe useful

http://babylonjsguide.github.io/snippets/Increasing_Facets

A facet is one of the trianglular planes that make up a mesh

[adam]

BJS does not currently have a mesh subdivide feature.

[aWeirdo]

@jorditantadiaz @adam 

Wouldn't splitting it into subMeshes be the same? or am i completely off as to what threeJs "subdivide" is?

subMeshes like when using multi-materials; https://www.eternalcoding.com/?p=283

[adam]

My understanding is that it is the same as the subdivide in blender.

http://blender-manual-i18n.readthedocs.io/ja/latest/modeling/meshes/editing/subdividing/subdivide.html

[jerome]

I guess Jorditantadiaz looks for this : https://threejs.org/examples/webgl_modifier_subdivision.html

[aWeirdo]

ahh

 

[jorditantadiaz]

Thanks @JohnK i am going to try it.

@jeromeYou are right i want to do that but on Babylon JS not in ThreeJS.

@adam Yes!!, i am trying to do the same as the subdivide in blender, if there is not a subdivide in BabylonJS, is there any way to increment polygons on mesh?

 

[adam]

One thing you could do is subdivide it in your modeling software and then simplify it in BJS.

[adam]

http://doc.babylonjs.com/tutorials/In-Browser_Mesh_Simplification_(Auto-LOD)

[aWeirdo]

@jorditantadiaz 

While there actually is a mesh.subdivide(number) function, it doesn't seem to update the mesh.
 

" But unfortunately (As we try to simplify rendering) we do not have a way to increase mesh complexity "-Deltakosh

 

a "work-around" that might work for you, would be to have several LOD's of your model.
http://www.babylonjs-playground.com/#1DTMBL#1 // Click on the sphere.

[jorditantadiaz]

@adam Yeah but if i do that i will need to download a big file and that is not a option for me D:

[Dad72]

And the use of octree does not make it that ?

mesh.createOrUpdateSubmeshesOctree(); //To call at the end of the loading of your scenes

and subdivide exist: => http://doc.babylonjs.com/classes/2.5/Mesh#subdivide-count-rarr-void

In a single line you do what ThreeJS does in 5 lines

mesh.subdivide(3); //Value 3 may not work. Try another value if that is the case.

 

[adam]

@Dad72  it doesn't do the same thing, though:

[GameMonetize]

Correct me if I'm wrong but you can also delete the current object and recreate it with more subdivisions right?

Like playing with the tesselation parameters of Sphere or Disc? (https://github.com/BabylonJS/Babylon.js/blob/master/src/Mesh/babylon.meshBuilder.ts#L74)

[Nabroski]

for (var lod = 1; lod <= MESH_LOD; ++lod) easy

[jorditantadiaz]

@Dad72 It's something like that, but for example, subdividing modifier into ThreeJS, it increases my vertex and smooth my geometry.

https://threejs.org/examples/webgl_modifier_subdivision.html