Sorry, I forgot to mention I’ve been building with 1.8.
My shader fails to work using either of these.
runtime.panda3d.org/packp3d.p3d
runtime-dev.panda3d.org/packp3d.p3d
It only works properly with this one.
runtime-dev.panda3d.org/packp3d_dev.p3d
Oh, thanks Nemesis!