Procedurally Generating 3D Models

Friesess · August 28, 2016, 3:54am

montreal:

For those about to rock clean and working piece of code that generates a single triangle.

#!/usr/bin/env python
import sys

from direct.showbase.ShowBase   import ShowBase

from panda3d.core               import Geom, GeomNode
from panda3d.core               import GeomVertexFormat, GeomVertexWriter, GeomVertexData 
from panda3d.core               import GeomTriangles
from panda3d.core               import NodePath
from panda3d.core               import PointLight
from panda3d.core               import VBase4

class FooBarTriangle( ShowBase ):
    def __init__( self ):
        # Basics
        ShowBase.__init__( self )

        base.disableMouse()
        base.setFrameRateMeter( True )
        
        self.accept( "escape", sys.exit )
        self.camera.set_pos( -10, -10, 10 )
        self.camera.look_at( 0, 0, 0 )

        # A light
        plight      = PointLight( "plight" )
        plight.setColor( VBase4( 0.5, 0.5, 0.5, 1 ) )

        plnp        = render.attachNewNode( plight )
        plnp.setPos( 10, 10, 10 )

        render.setLight( plnp )
        
        # Create the geometry
        vformat     = GeomVertexFormat.getV3n3c4()

        vdata       = GeomVertexData( "Data", vformat, Geom.UHStatic )
        vdata.setNumRows( 3 )

        vertex      = GeomVertexWriter( vdata, 'vertex'  )
        normal      = GeomVertexWriter( vdata, 'normal'  )
        color       = GeomVertexWriter( vdata, 'color'  )

        vertex.addData3f( 1, 0, 0 )
        normal.addData3f( 0, 0, 1 )
        color.addData4f( 0, 0, 1, 1 )

        vertex.addData3f( 1, 1, 0 )
        normal.addData3f( 0, 0, 1 )
        color.addData4f( 0, 0, 1, 1 )

        vertex.addData3f( 0, 1, 0 )
        normal.addData3f( 0, 0, 1 )
        color.addData4f( 0, 0, 1, 1 )

        prim        = GeomTriangles( Geom.UHStatic )

        prim.addVertices( 0, 1, 2 )
        prim.closePrimitive()

        geom        = Geom( vdata )
        geom.addPrimitive( prim )

        node        = GeomNode( "GNode" )
        node.addGeom( geom )

        nodePath    = self.render.attachNewNode( node )

demo = FooBarTriangle()
demo.run()

thanks so much for this. there are plenty of codes here huh. but i know this will work. thanks alot.