Is there an api way to access maya modeling toolkit component pre selection?

[dragoavdalovic]

When mouse hover the mesh face I would like it to get highlighted. Is there any way to acheive that with maya api?

I looked online but could not find anything useful.

Any help is highly appreciated.

Thanks, 

Drago

[cheng_xi_li]

Hi,

I think you can try to install QTEvent filters in the viewport panels to implement a hover event. After that you can try to use MGlobal::getHiliteList get a highlist in viewport and do intersect with the objects in the list.

Yours,

Li

[dragoavdalovic]

Thanks Li for your reply!

I already installed eventFilter mouseMove and I am able to get face id when my mouse hovers it. That part is working. 

At the same time I am looking for the way to hilite that hovered face(NOT to select it). Idealy the behaviour would be the same as when you use modeling toolkit face component and move mouse over mesh(face). If you cursor is over the face than you see that face highlithed with red edges. I would like to be able to have a same behaviour if it is possible.

Working with MGlobal.getHiliteList andf MGlobal.setHiliteList seem not to work on component level. I was only able to get or set hilite for the whole mesh.

Any ideas?

Please see attached image.

Thanks,

Drago

[cheng_xi_li]

Hi drago,

I think you have to draw it yourself. Maya toolkit component uses OpenMaya and OpenMayaUI API to draw highlight, there isn't an interface related to this I am afraid.

Yours,

Li

[dragoavdalovic]

Thanks Li for your help, could you point me to some examples? Would be highly appreciated! 🙂

Drago

[dragoavdalovic]

Hi Li;

I am having issues with viewport 2.0. The code below works in any legacy viewport but not in viewport 2.0. 

It is just a simple script that draws a red quad at the origin. Running in viewport 2.0 creates nothing. My maya version is 2015.

Any idea why is not working in viewport 2.0?

Thanks,

Drago

# ------------------------------------------------------

from maya import OpenMayaUI
import maya.OpenMayaRender as OpenMayaRender

view = OpenMayaUI.M3dView.active3dView()
glFT = OpenMayaRender.MHardwareRenderer.theRenderer().glFunctionTable()
view.beginXorDrawing(False, False, 2, OpenMayaUI.M3dView.kStippleNone, OpenMaya.MColor(1,1,1))
glFT.glBegin(OpenMayaRender.MGL_QUADS)
glFT.glColor3f(1.0, 0.0, 0.0)
glFT.glVertex3f(0,0,0)
glFT.glVertex3f(1,0,0)
glFT.glVertex3f(1,1,0)
glFT.glVertex3f(0,1,0)
glFT.glEnd()
glFT.glPopAttrib()
view.endXorDrawing()
glFT.glClear(OpenMayaRender.MGL_QUADS)

# ----------------------------------------------------

[cheng_xi_li]

Hi Drago,

You can attach a MPxSelectionContext with MPxManipContainer. 

When mouse is moving in the Viewport, you should be able to receive a draw event in the manipulator or you can try to call M3dView::active3dView().refresh() to enforce a draw. You can draw highlight in the event. 

Yours,

Li

[cheng_xi_li]

Hi drago,

If you don't want to use the MPxManipContainer, you can also try with drawFeedBack in MPxContext.

There is a sample(grabUVMain.cpp) which use MPxContext::drawFeedback, although it is designed for uv editor(MPxTexContext). I think it could be a reference.

Yours,

Li