Hi Xiyu
I'm not fully sure what it is you are trying to do but if it helps I
think what I think you are describing is doable, just forget about the
MFnMesh approach as what you are after is a user display plugin, rather
than a mesh influencing plugin so to say.
I don't have access to Maya right now but the settings for vertex sizes
are in Display --> polygons --> Set vertex size.
Three ways to go about this that I can think of quickly, don't have any
examples but hope this gets you started:
a)
Since the setting is there, then there is definitely a configuration file
somewhere on your hard drive where the vertex size setting you save is
stored. This may be a global setting ( just one size per Maya instance )
but if you are in luck then this draw setting is per camera, you can build
yourself a layered persp camera which displays a matrix part of your
workspace per size settings { 3 different size settings in your plugin == 3
cameras baked into one, each displaying the vertex size you set that part
of the geometry to }
b)
You tap into the actual workspace 2.0 API, look around for anything
that's per vertex and see if you can simply add a scaling effect of sorts.
Instancing using Alembic, Assemblies, and Workspace 2.0 shows amazing real
time response times. If all you are after is an enhanced wireframe mode
rather than a full blown real time shaded environment then create a plugin
that picks up whenever you are in wireframe mode and slap a literal lambert
shaded polyCube on each vertex. The effort for Workspace 2.0 to render
wireframe is so minimal you can get away with adding actual geometry to
help with the visual side without everything turning sluggish.
c)
Write a shader that does the trick, all shaders, even the simplest ones,
have the core functionality of doing things to geometry per vertex. Again
here this would be drawing additional squares on top of your geometry while
retaining performance speeds but at the end of the day you should get the
same effect.
Hope this ramble helps and you manage to get your plugin working, please
share if you do!
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