My node uses a custom transparent shader, but the draw 3D line function is clipping the line at the node, rather than drawing through/over it.
Any ideas how to best control this?
How to make draw 3D line go through transparent node
Re: How to make draw 3D line go through transparent node
It sounds like you have zwriting enabled for the transparent shader. What's the base material of your custom shader? It should be disabled if you use a transparent material as base for the shader. Any material with TRANSPARENT or BLEND in it should work I think (at least in svn trunk, there's been a few changes since 1.8... though that part is likely the same there).
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Re: How to make draw 3D line go through transparent node
Thanks, yes, that was it, thought I had that disabled 
