CallbackNode

from panda3d.core import CallbackNode

class CallbackNode

Bases: PandaNode

A special node that can issue arbitrary callbacks to user code, either during the cull or draw traversals.

Inheritance diagram

__init__(*args, **kwargs)

clearCullCallback()

C++ Interface: clear_cull_callback(const CallbackNode self)

/**

• Removes the callback set by an earlier call to set_cull_callback().

*/

clearDrawCallback()

C++ Interface: clear_draw_callback(const CallbackNode self)

/**

• Removes the callback set by an earlier call to set_draw_callback().

*/

clear_cull_callback()

C++ Interface: clear_cull_callback(const CallbackNode self)

/**

• Removes the callback set by an earlier call to set_cull_callback().

*/

clear_draw_callback()

C++ Interface: clear_draw_callback(const CallbackNode self)

/**

• Removes the callback set by an earlier call to set_draw_callback().

*/

cull_callback

draw_callback

getClassType()

C++ Interface: get_class_type()

getCullCallback()

C++ Interface: get_cull_callback(CallbackNode self)

/**

• Returns the CallbackObject set by set_cull_callback().

*/

getDrawCallback()

C++ Interface: get_draw_callback(CallbackNode self)

/**

• Returns the CallbackObject set by set_draw_callback().

*/

get_class_type()

C++ Interface: get_class_type()

get_cull_callback()

C++ Interface: get_cull_callback(CallbackNode self)

/**

• Returns the CallbackObject set by set_cull_callback().

*/

get_draw_callback()

C++ Interface: get_draw_callback(CallbackNode self)

/**

• Returns the CallbackObject set by set_draw_callback().

*/

setCullCallback()

C++ Interface: set_cull_callback(const CallbackNode self, CallbackObject object)

/**

• Sets the CallbackObject that will be notified when this node is visited

• during the cull traversal. This callback will be made during the cull

• thread.

• The cull traversal is responsible for determining which nodes are visible

• and within the view frustum, and for accumulating state and transform, and

• generally building up the list of CullableObjects that are to be eventually

• passed to the draw traversal for rendering.

• At the time the cull traversal callback is made, the node has been

• determined to be visible and it has passed the bounding-volume test, so it

• lies within the view frustum.

• The callback is passed an instance of a NodeCullCallbackData, which

• contains pointers to the CullTraverser and CullTraverserData–enough data

• to examine the current node and its place within the scene graph. The

• callback replaces the normal cull behavior, so if your callback does

• nothing, the cull traversal will not continue below this node. If you wish

• the cull traversal to continue to visit this node and below, you must call

• cbdata->upcall() from your callback.

*/

setDrawCallback()

C++ Interface: set_draw_callback(const CallbackNode self, CallbackObject object)

/**

• Sets the CallbackObject that will be notified when this node is visited

• during the draw traversal. This callback will be made during the draw

• thread.

• The draw traversal is responsible for actually issuing the commands to the

• graphics engine to draw primitives. Its job is to walk through the list of

• CullableObjects build up by the cull traversal, as quickly as possible,

• issuing the appropriate commands to draw each one.

• At the time the draw traversal callback is made, the graphics state has

• been loaded with the correct modelview transform and render state, and the

• primitives (if any) in this node are ready to be drawn.

• The callback is passed an instance of a GeomDrawCallbackData, which

• contains pointers to the current state and transform, as well as the

• current GSG. There is a Geom pointer as well, but it will always be NULL

• to this callback, since the CallbackNode does not itself contain any Geoms.

*/

set_cull_callback()

C++ Interface: set_cull_callback(const CallbackNode self, CallbackObject object)

/**

• Sets the CallbackObject that will be notified when this node is visited

• during the cull traversal. This callback will be made during the cull

• thread.

• The cull traversal is responsible for determining which nodes are visible

• and within the view frustum, and for accumulating state and transform, and

• generally building up the list of CullableObjects that are to be eventually

• passed to the draw traversal for rendering.

• At the time the cull traversal callback is made, the node has been

• determined to be visible and it has passed the bounding-volume test, so it

• lies within the view frustum.

• The callback is passed an instance of a NodeCullCallbackData, which

• contains pointers to the CullTraverser and CullTraverserData–enough data

• to examine the current node and its place within the scene graph. The

• callback replaces the normal cull behavior, so if your callback does

• nothing, the cull traversal will not continue below this node. If you wish

• the cull traversal to continue to visit this node and below, you must call

• cbdata->upcall() from your callback.

*/

set_draw_callback()

C++ Interface: set_draw_callback(const CallbackNode self, CallbackObject object)

/**

• Sets the CallbackObject that will be notified when this node is visited

• during the draw traversal. This callback will be made during the draw

• thread.

• The draw traversal is responsible for actually issuing the commands to the

• graphics engine to draw primitives. Its job is to walk through the list of

• CullableObjects build up by the cull traversal, as quickly as possible,

• issuing the appropriate commands to draw each one.

• At the time the draw traversal callback is made, the graphics state has

• been loaded with the correct modelview transform and render state, and the

• primitives (if any) in this node are ready to be drawn.

• The callback is passed an instance of a GeomDrawCallbackData, which

• contains pointers to the current state and transform, as well as the

• current GSG. There is a Geom pointer as well, but it will always be NULL

• to this callback, since the CallbackNode does not itself contain any Geoms.

*/