# CullTraverserData¶

class CullTraverserData

This collects together the pieces of data that are accumulated for each node while walking the scene graph during the cull traversal.

Having this as a separate object simplifies the parameter list to CullTraverser::r_traverse(), as well as to other functions like PandaNode::cull_callback(). It also makes it easier to add cull parameters, and provides a place to abstract out some of the cull behavior (like view-frustum culling).

Inheritance diagram

CullTraverserData(CullTraverserData const&) = default

This constructor creates a CullTraverserData object that reflects the next node down in the traversal.

void apply_transform(TransformState const *node_transform)

Applies the indicated transform changes onto the current data.

void apply_transform_and_state(CullTraverser *trav)

Applies the transform and state from the current node onto the current data. This also evaluates billboards, etc.

ConstPointerTo<TransformState> get_internal_transform(CullTraverser const *trav) const

Returns the internal transform: the modelview transform in the GSG’s internal coordinate system.

ConstPointerTo<TransformState> get_modelview_transform(CullTraverser const *trav) const

Returns the modelview transform: the relative transform from the camera to the model.

TransformState const *get_net_transform(CullTraverser const *trav) const

Returns the net transform: the relative transform from root of the scene graph to the current node.

bool is_in_view(DrawMask const &camera_mask)

Returns true if the current node is within the view frustum, false otherwise. If the node’s bounding volume falls completely within the view frustum, this will also reset the view frustum pointer, saving some work for future nodes.

bool is_this_node_hidden(DrawMask const &camera_mask) const

Returns true if this particular node is hidden, even though we might be traversing past this node to find a child node that has had show_through() called for it. If this returns true, the node should not be rendered.

PandaNode *node(void) const

Returns the node traversed to so far.