Hello,
I am trying to figure out what is the correct approach for importing a GLTF model, and then accessing its information to create a BufferGeometry object for use?
For example:
Load GLTF
Convert GLTF Model to BufferGeometry
Do Something with BufferGeometry
Thanks in advance!
O.
When loading a glTF asset, all geometry data are already represented as instances of BufferGeometry.
Keep in mind that a model (for example an animated mesh) always consist of one or more materials describing its surface properties and a single geometry describing its actual 3D shape.
Thanks for the clarification
As an example - based on the gltf loader example - would something like this do the job:
//create buffer geometry
var glTFGeometry = new THREE.BufferGeometry();
var loader = new THREE.RGBELoader().setPath( 'textures/equirectangular/' );
loader.load( 'pedestrian_overpass_2k.hdr', function ( texture ) {
texture.encoding = THREE.RGBEEncoding;
texture.minFilter = THREE.NearestFilter;
texture.magFilter = THREE.NearestFilter;
texture.flipY = true;
var cubeGenerator = new THREE.EquirectangularToCubeGenerator( texture, { resolution: 1024 } );
cubeGenerator.update( renderer );
var pmremGenerator = new THREE.PMREMGenerator( cubeGenerator.renderTarget.texture );
pmremGenerator.update( renderer );
var pmremCubeUVPacker = new THREE.PMREMCubeUVPacker( pmremGenerator.cubeLods );
pmremCubeUVPacker.update( renderer );
var envMap = pmremCubeUVPacker.CubeUVRenderTarget.texture;
// model
var loader = new THREE.GLTFLoader().setPath( 'models/gltf/DamagedHelmet/glTF/' );
loader.load( 'DamagedHelmet.gltf', function ( gltf ) {
gltf.scene.traverse( function ( child ) {
if ( child.isMesh ) {
child.material.envMap = envMap;
//Setting the buffer geometry
glTFGeometry = child;
}
} );
scene.add( gltf.scene );
} );
pmremGenerator.dispose();
pmremCubeUVPacker.dispose();
scene.background = cubeGenerator.renderTarget;
} );
//use glTFGeometry as buffer geometry.... ie. processGeometry( bufGeometry )
processGeometry(glTFGeometry);You can access the geometry via child.geometry. Otherwise you reference the entire mesh.
Okay great - so more like this:
gltf.scene.traverse( function ( child ) {
if ( child.isMesh ) {
child.material.envMap = envMap;
}
//Setting the buffer geometry
glTFGeometry = child.geometry;
} );gltf.scene.traverse( function ( child ) {
if ( child.isMesh ) {
child.material.envMap = envMap;
//Setting the buffer geometry
glTFGeometry = child.geometry;
}
} );
You only want to do this for meshes since other type of objects are part of gltf.scene like THREE.Object3D. Besides, keep in mind that a glTF asset can have multiple meshes. With your code, you only retrieve the last geometry object encountered in the traversal.
Great thanks so much! Definitely clears things up.
Reason for this is I have been trying to create custom shapes and objects to be loaded as gltf, then to be converted to BufferGeometry for use as physics volumes as in the volumes example: https://threejs.org/examples/?q=volume#webgl_physics_volume
Getting a bunch of new errors now passing the buffer geometry into the createSoftVolume(bufferGeom, mass, pressure ) function - but for now I guess the question has been answered! Thanks again!
Hi, I am trying to do the same thing. I imported a glTF to which I want to add soft body physics based on this example Ammo.js softbody volume demo
I am using the gltf.scene.traverse function, then using createSoftVolume(bufferGeom, mass, pressure ) with the gltfGeometry.
As you can see in the attached screenshot the BufferGeometry is obtained with the code you gave in this thread ( can be seen in the console ).
I have the loaded glTF on the plane, in front of the ramp. Once I call createSoftVolume() the glTF is bugging ( only sides of object visible ) and a body appears next to the ramp, which does not have the soft body physics as the objects in the example scene.
Please let me know if I am being clear in describing what I am trying to achieve and the issue I’m having!
Apologies as well if the solution to my problem is already in this thread, I cannot figure out how to get it to work.
Thanks in advance for your help!
hi what did you do i want to know it’s possible or not
