CullTraverserData¶

from acron.core import CullTraverserData

class CullTraverserData¶

Bases:

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 AcronNode::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

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__init__()¶

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

apply_cull_planes()¶: Applies the cull planes. Returns true if the node should still be rendered, false if it should be culled.

apply_transform()¶: Applies the indicated transform changes onto the current data.

apply_transform_and_state()¶: Applies the transform and state from the current node onto the current data. This also evaluates billboards, etc.

get_internal_transform()¶: Returns the internal transform: the modelview transform in the GSG’s internal coordinate system.

get_modelview_transform()¶: Returns the modelview transform: the relative transform from the camera to the model.

get_net_transform()¶: Returns the net transform: the relative transform from root of the scene graph to the current node.

is_in_view()¶: Returns intersection flags if the current node may be within the view frustum, 0 otherwise.

is_this_node_hidden()¶: 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.

node()¶: Returns the node traversed to so far.

property node_path → NodePath¶: Constructs and returns an actual NodePath that represents the same path we have just traversed.

property view_frustum → GeometricBoundingVolume¶: Returns/Changes the transformed view frustum being used for culling at this level.