---
layout: example.html
title: Layer Swipe (WebGL)
shortdesc: Cropping a WebGL tile layer
docs: >
The prerender
and postrender
events on a WebGL tile layer can be
used to manipulate the WebGL context before and after rendering. In this case, the
gl.scissor()
method is called to clip the top layer based on the position of a slider.
tags: "swipe, webgl"
cloak:
- key: get_your_own_D6rA4zTHduk6KOKTXzGB
value: Get your own API key at https://www.maptiler.com/cloud/
---