My Google Chrome browser is flooded with countless errors:
[.CommandBufferContext]RENDER WARNING: Render count or primcount is 0.
These errors occur when using OBJ and MTL files exported from Blender, specifically with the OBJMTLLoader.js as the loader after upgrading to version R73.
Has anyone else encountered this issue?
If you encounter an error where the low-level render call is drawing zero vertices/faces, it could be due to having one or more meshes with polygons that have no faces or vertices. This error accumulates on each draw call.
The issue may lie in your model itself or during the export/import process. If it's related to the model, here is a general approach to identify problematic areas. It is not recommended to use OBJMTLLoader with ThreeJS and Blender since ThreeJS comes with a Blender plugin for exporting that is more reliable.
checkMesh = function(mesh, child_index) {
if (
mesh.geometry.faces.length > 0 &&
mesh.geometry.vertices.length > 0
) {
// perform operations on the valid mesh
for (var i = 0; i < mesh.children.length; i++)
if (!checkMesh(mesh.children[i], i))
i--; // move back as child was removed
return true;
} else {
if (mesh.parent != null)
mesh.parent.children.splice(child_index, 1);
console.log(mesh.name + " has zero faces and/or vertices so it is removed.");
mesh = null;
return false;
}
}Without being able to see your code, it's tough to pinpoint the issue, but I would recommend giving JSON export and import a try. In the three.js source, navigate to utils/exporters/blender and install the JSON exporter (refer to readme.md for instructions). After that, export your model to JSON while carefully selecting exporting options such as geometry type, UVs, and textures. Then, you can bring in your model using the following code snippet:
var loader = new THREE.JSONLoader();
loader.load("model.json", function(geometry, material) {
var m = new THREE.MultiMaterial(material);
var o = new THREE.Mesh(geometry, m);
scene.add(o);
});
I haven't done a direct comparison with OBJ/MTL, but based on my experience, JSON loading is significantly faster than Collada.
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