cleaning up

Scripting Issues
2

The script below creates a new NodePath with one triangle each frame (using GeomVertexWriter method), and remove it again in the next frame using NodePath.removeNode( ). The triangles are created with one random point, so Panda3D can’t reuse the old mesh data.

On my PC (Windows, Panda3D 1.4.2 as distributed) the memory usage stays constant after a few seconds. So it seems the unused models are unloaded completely by Panda3D.

I think you have a memory problem somewhere else. There are dozens of ways to shoot yourself in your own foot using Python (even using Python :-), for example by creating cyclic references. Could you provide a (small) example where you constantly re-create your models, and where memory usage rises?

enn0x

import direct.directbase.DirectStart

from direct.showbase.DirectObject import DirectObject
from pandac.PandaModules import Geom
from pandac.PandaModules import GeomNode
from pandac.PandaModules import GeomTriangles
from pandac.PandaModules import GeomVertexFormat
from pandac.PandaModules import GeomVertexData
from pandac.PandaModules import GeomVertexWriter

import sys
import random

class World( DirectObject ):

    def __init__( self ):
        base.toggleWireframe( )
        self.accept( 'escape', self.exit )
        taskMgr.add( self.update, 'update' )
        self.np = None

    def exit( self ):
        sys.exit( 1 )

    def update( self, task ):
        if self.np: self.np.removeNode( )

        self.np = self.createTriangle( )
        self.np.reparentTo( render )
        self.np.setPos( -0.5, 3.0, -0.5 )

        return task.cont

    def createTriangle( self ):
        format = GeomVertexFormat.getV3( )
        data = GeomVertexData( 'name', format, Geom.UHStatic )
        vertex = GeomVertexWriter( data, 'vertex' )

        x = random.random( )
        y = random.random( )
        z = random.random( )

        vertex.addData3f( 0, 0, 0 )
        vertex.addData3f( 1, 0, 0 )
        vertex.addData3f( x, y, z )

        prim = GeomTriangles( Geom.UHStatic )
        prim.addNextVertices( 3 )
        prim.closePrimitive( )

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

        node = GeomNode( 'gnode' )
        node.addGeom( geom )

        return render.attachNewNode( node )

world = World( )
run( )