Draw locator on top of scene in Maya Viewport 2.0

Anonymous — Thu, 09 Nov 2017 17:03:20 GMT

Hi everyone,

I have a locator node that I am drawing in the scene using MPxDrawOverride. I am thus drawing using the functions provided in the MUIDrawManager, especially MUIDrawManager::mesh(...).

On the above picture, my locator node is the blue bar that is going through the sphere. But I would like to draw this locator on top of everything in the scene (like one could show a skeleton in xRay). In that case, I want it to appear on top of the sphere at any time, as shown here:

I have tried using the MUIDrawManager::beginDrawInXray() and MUIDrawManager::endDrawInXray() function, but what they are doing is that they remove the depth test, so the triangles are drown on top of each other in a random order, which gives something awful like this:

Is there a clean way to draw a custom locator node on top of the scene? Maybe by re-initializing the depth buffer, but how do we have access? Or by rendering twice the scene and super-imposing the two images, but how do you do that?

Thank you for your help,

Loïc

Re: Draw locator on top of scene in Maya Viewport 2.0

cheng_xi_li — Mon, 13 Nov 2017 12:53:33 GMT

Hi,

You can't have depth in XRay mode. To do that, usually it should be drawn with a separate empty depth buffer.

In theory, you could try to write a custom drawing with DX and OpenGL directly with MPxDrawOverride with a different depth buffer with DX and OpenGL directly, you could look at them to learn how to draw with MPxDrawOverride.

It should make it at the front of any other items. Try to draw them at the one of the last passes.

You could also try to create another MRenderOverride to replace VP2 with custom passes for it. I haven't tested them yet, but they should be working .

Yours,

topic Draw locator on top of scene in Maya Viewport 2.0 in Maya Programming Forum

Draw locator on top of scene in Maya Viewport 2.0

Re: Draw locator on top of scene in Maya Viewport 2.0