Examples: Add textured assets to webgl_loader_fbx.

[tatsuya-ogawa]

Related issue: #31032

Description

• add fbx example model for checking FbxLoader with texture.
• the model file is created by blender(suzanne model),and exported fbx with COPY path mode.

[WestLangley]

The textures are not being disposed of properly when the models are changed.

[Mugen87]

The example already has this code:

three.js/examples/webgl_loader_fbx.html

Lines 133 to 143 in 3a21dee

	if ( child.material ) {
	const materials = Array.isArray( child.material ) ? child.material : [ child.material ];
	materials.forEach( material => {
	if ( material.map ) material.map.dispose();
	material.dispose();
	} );
	}

Isn't that sufficient?

[WestLangley]

The number of textures keeps increasing...

console.log( renderer.info.memory );

[Mugen87]

I have reverted the PR because the assets are not optimal, see #31067 (comment).

However, the issue still exists since the skinned mesh does not call dispose() on its skeleton when removed from the scene. So the memory leak was present even before this PR was merged.

[WestLangley]

@Mugen87 Is there a way for the user to see a clue as to what, exactly, the textures are? renderer.info.memory provides the count.

[Mugen87]

That is not possible so far. The user would have to debug and then check for example the isRenderTargetTexture flag to see whether a texture belongs to a render target or not. And even if you now it's a render target texture, there is no back reference to the render target. So it could be a shadow map (like in the FBX demo) or a render targert from post processing or something completely different.