WorldViz User Forum - Identify a class via its mesh

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- - Identify a class via its mesh (https://forum.worldviz.com/showthread.php?t=4137)

Identify a class via its mesh

So I've been having a problem for a while, I need to identify a class object via the 3D mesh that represents it in the environment.

Example code:

Code:

import viz

import vizact



#Sample Environment

ground = viz.add('tut_ground.wrl')

ground.tag = "You missed clicking on a box."



class exampleObject(object):        #Example class containing a mesh

        def __init__(self,classTag,geometryTag,x,y,z,color):

                self.tag = classTag

                self.model = viz.add('box.wrl')

                self.model.tag = geometryTag

                self.model.setPosition(x,y,z)

                self.model.color(color)

                self.model.setScale(.333,.333,.333)



#Creating some objects

A = exampleObject("classA","geometryA",-.5,1.6,2,viz.RED)

B = exampleObject("classB","geometryB",0,1.6,2,viz.BLUE)

C = exampleObject("classC","geometryC",.5,1.6,2,viz.GREEN)



def clickPick():        #Pick an object

        mesh = viz.pick()

        classObject = mesh  ###This line should be modified###

        print classObject.tag



vizact.onmousedown(viz.MOUSEBUTTON_LEFT, clickPick)        #Pick an object on Left-click



viz.go()





#The problem, how do I go from the mesh to the class object...



#As in what (function) do I need to apply to the [mesh] to return the [class object]

#Example:



def classPick():        #Pick an object, print it's class' tag

        mesh = viz.pick()

        classObject = mesh.(function)()

        print classObject.tag

        

#Should print "classA" rather than "geometryA"

#Should print "classB" rather than "geometryB"

#Should print "classC" rather than "geometryC"

How do I get it to return the class object rather than the geometry?

If you have your exampleObject class inherit from the Vizard node class, then your class instance will be returned from the pick command. I modified your example to show this:

Code:

import viz

import vizact



#Sample Environment

ground = viz.add('tut_ground.wrl')

ground.tag = "You missed clicking on a box."



class exampleObject(viz.VizNode):        #Example class containing a mesh

        def __init__(self,classTag,geometryTag,x,y,z,color):



                model = viz.add('box.wrl')

                viz.VizNode.__init__(self,model.id)



                self.class_tag = classTag

                self.geometry_tag = geometryTag

                self.setPosition(x,y,z)

                self.color(color)

                self.setScale(.333,.333,.333)



        def printTag(self):

                print self.class_tag,self.geometry_tag



#Creating some objects

A = exampleObject("classA","geometryA",-.5,1.6,2,viz.RED)

B = exampleObject("classB","geometryB",0,1.6,2,viz.BLUE)

C = exampleObject("classC","geometryC",.5,1.6,2,viz.GREEN)



def clickPick():        #Pick an object

        mesh = viz.pick()

        if isinstance(mesh,exampleObject):

                mesh.printTag()



vizact.onmousedown(viz.MOUSEBUTTON_LEFT, clickPick)        #Pick an object on Left-click



viz.go()