preview overrides

Hi,

What is the difference between:

override DrawViewportMeshes

override DrawViewportWires

And in what case I need to override the boundingBox?

Thanks

Replies to This Discussion

Permalink Reply by Giulio Piacentino on November 25, 2016 at 8:06am

Hi Tomas,

You usually need to override BoundingBox for both.

One should draw the wires (the "lines", or the "curves"), like in wireframe, and the other the meshes (like the "surfaces", as in shaded mode in Rhino).

I hope this helps

Giulio
--
Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com

Permalink Reply by Tomas Vinkevicius on November 25, 2016 at 8:15am

Hi,

Thank you for a reply.

But I managed to draw curves, lines in mesh preview override.

Why is that so?

Kind Regards,

Tomas

Permalink Reply by David Rutten on November 25, 2016 at 9:11am

You need to override the boundingbox if you're planning to draw something outside of the boundingbox which contains all the other Grasshopper preview geometry. Since it is very difficult to know whether or not this is the case, it's best to always override the boundingbox.

DrawViewportWires is called first and here you're supposed to draw all points and curves. DrawViewportMeshes is called later and this is where you can draw transparent stuff, such as meshes. The reason transparent geometry needs to be drawn last is because otherwise it may occlude stuff behind it, even though you'd be able to see it 'through' the object.

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