72 lines
3.0 KiB
C++
72 lines
3.0 KiB
C++
// Filename: selectiveChildNode.cxx
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// Created by: drose (06Mar02)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) Carnegie Mellon University. All rights reserved.
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//
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// All use of this software is subject to the terms of the revised BSD
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// license. You should have received a copy of this license along
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// with this source code in a file named "LICENSE."
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//
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////////////////////////////////////////////////////////////////////
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#include "selectiveChildNode.h"
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TypeHandle SelectiveChildNode::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: SelectiveChildNode::has_selective_visibility
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// Access: Public, Virtual
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// Description: Should be overridden by derived classes to return
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// true if this kind of node has some restrictions on
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// the set of children that should be rendered. Node
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// with this property include LODNodes, SwitchNodes, and
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// SequenceNodes.
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//
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// If this function returns true,
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// get_first_visible_child() and
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// get_next_visible_child() will be called to walk
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// through the list of children during cull, instead of
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// iterating through the entire list. This method is
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// called after cull_callback(), so cull_callback() may
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// be responsible for the decisions as to which children
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// are visible at the moment.
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////////////////////////////////////////////////////////////////////
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bool SelectiveChildNode::
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has_selective_visibility() const {
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SelectiveChildNode::get_first_visible_child
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// Access: Public, Virtual
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// Description: Returns the index number of the first visible child
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// of this node, or a number >= get_num_children() if
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// there are no visible children of this node. This is
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// called during the cull traversal, but only if
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// has_selective_visibility() has already returned true.
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// See has_selective_visibility().
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////////////////////////////////////////////////////////////////////
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int SelectiveChildNode::
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get_first_visible_child() const {
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return _selected_child;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SelectiveChildNode::get_next_visible_child
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// Access: Public, Virtual
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// Description: Returns the index number of the next visible child
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// of this node following the indicated child, or a
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// number >= get_num_children() if there are no more
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// visible children of this node. See
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// has_selective_visibility() and
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// get_first_visible_child().
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////////////////////////////////////////////////////////////////////
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int SelectiveChildNode::
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get_next_visible_child(int n) const {
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return get_num_children();
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}
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