Layer Clipping example is not working

I’m searching for example to render glsl shaders ontop of map. I found this example , but it is not working.

To Reproduce Steps to reproduce the behavior:

1. Go to https://openlayers.org/en/latest/examples/layer-clipping-webgl.html
2. See error (no map)

found bugs:

1. change pre/postcompose to pre/postrender

[jahow]

Hi @microspace, what you could do is use a post processing pass on a webgl layer to exclude a part of the final render, like the layer clipping example used to do. You can take a look at the HeatmapLayer class which uses custom shaders.

The webgl points layer could also offer the possibility to add custom post processing shaders, IMO that would make sense but it’s not the case yet.

[microspace]

Hi @jahow thank you for pointing to HeatmapLayer!