repro: Babylon.js Playground
renderOutline doesn’t work when needDepthPrePass = true; What do I need to turn on to get both to work correctly ?
well pumping values into the material depthFunction works. eg: myMaterial.depthFunction = 0x0207; but I have no idea what its doing ? Seems like when the depthFunction is Always/Greater/Greater or equal/not equal, the outline render works. I presume its setting for depth sorting ?
This needs a doc. 
Changing the depthFunction value may work in the demo scene but it will break depending on how the objects are sorted/the rendering order.
Unfortunately, needDepthPrePass=true and the outline renderer are incompatible, I don’t see a clean way to fix it as they interfere with each other…
A somewhat more dirty way to do it would be to clone the object, mark this clone as needDepthPrePass=true and set material.disableColorWrite:
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I see, so they are mutually exclusive. Got it, thanks!