Looking at the code in the Three.js RTT sample, it appears like this:
renderer.render( sceneRTT, cameraRTT, rtTexture, true );
// Render full screen quad with generated texture
renderer.render( sceneScreen, cameraRTT );
Is there a way to ensure that the rtTexture is fully rendered before accessing its data in the line
renderer.render( sceneScreen, cameraRTT );No need to worry about checking the rendering process before fetching it. WebGL, like all OpenGL operations, occurs sequentially according to the specifications.
Chapter 2
Understanding OpenGL ES
2.1 Key Concepts of OpenGL ES
...
Commands are executed in the order they are received, with a possible delay before their effects are fully carried out. This means that each primitive must be drawn completely before the next one can impact the framebuffer. It also ensures that queries and pixel read operations provide data consistent with the execution of all previous GL commands. Essentially, the impact of a GL command on both GL modes and the framebuffer needs to be finalized before subsequent commands can take effect.
This same explanation can be found in the official OpenGL documentation
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