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@@ -227,7 +227,7 @@ draw_lines()
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// for now. More functionalities coming up
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////////////////////////////////////////////////////////////////////
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void PortalClipper::
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-prepare_portal(NodePath &node_path)
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+prepare_portal(const NodePath &node_path)
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{
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SegmentList segs;
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@@ -290,7 +290,7 @@ prepare_portal(NodePath &node_path)
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// and form the new planes of the reduced view frustum
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////////////////////////////////////////////////////////////////////
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void PortalClipper::
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-clip_portal(NodePath &node_path)
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+clip_portal(const NodePath &node_path)
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{
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int num_planes = _hex_frustum->get_num_planes();
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@@ -331,7 +331,7 @@ clip_portal(NodePath &node_path)
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// fill in the new frustum. Return true if success
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////////////////////////////////////////////////////////////////////
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PT(BoundingVolume) PortalClipper::
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-get_reduced_frustum(NodePath &node_path)
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+get_reduced_frustum(const NodePath &node_path)
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{
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int num_planes = 6;
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LPoint3f intersect_points[4];
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