Source code for moderngl_window.scene.node

Wrapper for a loaded mesh / vao with properties
from pyrr import matrix44

[docs]class Node: """A generic scene node containing a mesh or camera and/or a container for other nodes. Nodes and their children represents the scene tree. """
[docs] def __init__(self, camera=None, mesh=None, matrix=None): """Create a node. Keyword Args: camera: Camera to store in the node mesh: Mesh to store in the node matrix: The node's matrix """ = camera self.mesh = mesh # Local matrix self.matrix = matrix # Global matrix self.matrix_global = None self.matrix_global_bytes = None self._children = []
@property def children(self): """list: List of children""" return self._children
[docs] def add_child(self, node): """Add a child to this node Args: node (Node): Node to add as a child """ self._children.append(node)
[docs] def draw(self, projection_matrix=None, camera_matrix=None, time=0): """Draw node and children. Keyword Args: projection_matrix (bytes): projection matrix camera_matrix (bytes): camera_matrix time (float): The current time """ if self.mesh: self.mesh.draw( projection_matrix=projection_matrix, model_matrix=self.matrix_global_bytes, camera_matrix=camera_matrix, time=time ) for child in self._children: child.draw( projection_matrix=projection_matrix, camera_matrix=camera_matrix, time=time )
[docs] def draw_bbox(self, projection_matrix, camera_matrix, program, vao): """Draw bounding box around the node and children. Keyword Args: projection_matrix (bytes): projection matrix camera_matrix (bytes): camera_matrix program (moderngl.Program): The program to render the bbox vao: The vertex array representing the bounding box """ if self.mesh: self.mesh.draw_bbox( projection_matrix, self.matrix_global_bytes, camera_matrix, program, vao ) for child in self.children: child.draw_bbox(projection_matrix, camera_matrix, program, vao)
[docs] def calc_global_bbox(self, view_matrix, bbox_min, bbox_max): """Recursive calculation of scene bbox. Keyword Args: view_matrix (numpy.ndarray): view matrix bbox_min: min bbox values bbox_max: max bbox values """ if self.matrix is not None: view_matrix = matrix44.multiply(self.matrix, view_matrix) if self.mesh: bbox_min, bbox_max = self.mesh.calc_global_bbox(view_matrix, bbox_min, bbox_max) for child in self._children: bbox_min, bbox_max = child.calc_global_bbox(view_matrix, bbox_min, bbox_max) return bbox_min, bbox_max
[docs] def calc_model_mat(self, model_matrix): """Calculate the model matrix related to all parents. Args: model_matrix (numpy.ndarray): model matrix """ if self.matrix is not None: self.matrix_global = matrix44.multiply(self.matrix, model_matrix).astype('f4') self.matrix_global_bytes = self.matrix_global.tobytes() for child in self._children: child.calc_model_mat(self.matrix_global) else: self.matrix_global = model_matrix self.matrix_global_bytes = model_matrix.tobytes() for child in self._children: child.calc_model_mat(model_matrix)