Mouse Moving

Does anyone know how i can tell through the api. what the mouse is
held over. things turn red when you hold the mouse over them. ie:
vertex, edge, surface. is this already a part of the api.

 

you already asked, and I already answered:

I'm afraid it is not available directly, you'll have to do something rather
tricky:
use microsoft's windows API to obtain the mouse pixel position in your
ModelView,
then ModelView::Transform to obtain the XYZ position in model space
then use ModelView::GetEyePoint to define a vector going from your eye
through the obtained point
and finally ModelDoc::RayIntersections+GetRayIntersectionsTopology, quite
complex especially in assemblies, to obtain the desired points.
Another way is to request apisupport to implement this api, and wait a few
years...
Maybe you'd rather stick to selections...