Backend: Add this.isWeb*Backend

[WestLangley]

I want to know which Backend is running. Maybe there is a better way...

console.log( 'renderer.backend: ', renderer.backend.isWebGLBackend ? 'WebGLBackend' : 'WebGPUBackend' );

[sunag]

Another alternative could be using renderer.coordinateSystem.

[WestLangley]

How would you describe what camera.coordinateSystem represents?

renderer.backend:  WebGPUBackend
renderer.coordinateSystem:  2001
camera.coordinateSystem:  2000

[sunag]

This happens because the default value of camera.coordinateSystem is WebGLCoordinateSystem, after the first rendering this value is updated for the chosen backend.

three.js/examples/jsm/renderers/common/Renderer.js

Lines 199 to 207 in 8581f79

	const coordinateSystem = this.coordinateSystem;
	if ( camera.coordinateSystem !== coordinateSystem ) {
	camera.coordinateSystem = coordinateSystem;
	camera.updateProjectionMatrix();
	}

[WestLangley]

I'm just trying to determine if the design may be too fragile... thanks for bearing with me. :-)

Are there any situations in which the renderer must be instantiated prior to the camera -- or the camera prior to the renderer?

[sunag]

It would not have priority in terms of instantiation, both can be declared before or after, renderer.coordinateSystem will always be the predominant value while camera.coordinateSystem must adapt to the renderer's backend. camera.coordinateSystem should not be recommended as a strong value for backend comparison unlike renderer.coordinateSystem.

It will always be a pleasure for me to refine any stage with you. :-)