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You have to load the complete 3D Scene in Vizard & you have to remove your unwanted nodes in following two ways:
1) By Culling them:
<node3d>.cullFace(viz.GL_FRONT_AND_BACK, node = ' ')
This will cull all the objects from node3d associated with node. GPU Memory will be still occupied with those objects associated with node.
2) By disabling them in rendering processes:
<node3d>.disable(viz.RENDERING, node = ' ')
This will disable the rendering of all the objects from node3d associated with node. GPU Memory will be released for those objects associated with this node.
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