Render a [page:Scene scene] using a [page:Camera camera].<br/>
The render is done to the [page:WebGLRenderTarget renderTarget] (if specified) or to the canvas as usual.<br/>
The render is done to a previously specified [page:WebGLRenderTarget renderTarget] set by calling [page:WebGLRenderer.setRenderTarget .setRenderTarget] or to the canvas as usual.<br/>
If [page:Boolean forceClear] is *true*, the depth, stencil and color buffers will be cleared
before rendering even if the renderer's [page:WebGLRenderer.autoClear autoClear] property is false.<br/>
Even with forceClear set to true you can prevent certain buffers being cleared by setting
either the [page:WebGLRenderer.autoClearColor autoClearColor], [page:WebGLRenderer.autoClearStencil autoClearStencil] or [page:WebGLRenderer.autoClearDepth autoClearDepth] properties to false.
By default render buffers are cleared before rendering but you can prevent this by setting the property [page:WebGLRenderer.autoClear autoClear] to false.
If you want to prevent only certain buffers being cleared you can set either the [page:WebGLRenderer.autoClearColor autoClearColor], [page:WebGLRenderer.autoClearStencil autoClearStencil] or
[page:WebGLRenderer.autoClearDepth autoClearDepth] properties to false. To forcibly clear one ore more buffers call [page:WebGLRenderer.clear .clear].