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# Copyright (c) 2015 Ultimaker B.V.
# Cura is released under the terms of the LGPLv3 or higher.
from UM.Application import Application
from UM.Scene.SceneNode import SceneNode
from UM.Resources import Resources
from UM.Math.Color import Color
from UM.Mesh.MeshBuilder import MeshBuilder # To create a mesh to display the convex hull with.
from UM.View.GL.OpenGL import OpenGL
class ConvexHullNode(SceneNode):
shader = None # To prevent the shader from being re-built over and over again, only load it once.
## Convex hull node is a special type of scene node that is used to display an area, to indicate the
# location an object uses on the buildplate. This area (or area's in case of one at a time printing) is
# then displayed as a transparent shadow. If the adhesion type is set to raft, the area is extruded
# to represent the raft as well.
def __init__(self, node, hull, thickness, parent = None):
super().__init__(parent)
self.setCalculateBoundingBox(False)
self._original_parent = parent
# Color of the drawn convex hull
self._color = Color(*Application.getInstance().getTheme().getColor("convex_hull").getRgb())
# The y-coordinate of the convex hull mesh. Must not be 0, to prevent z-fighting.
self._mesh_height = 0.1
self._thickness = thickness
# The node this mesh is "watching"
self._node = node
self._convex_hull_head_mesh = None
self._node.decoratorsChanged.connect(self._onNodeDecoratorsChanged)
self._onNodeDecoratorsChanged(self._node)
self._hull = hull
if self._hull:
hull_mesh_builder = MeshBuilder()
if hull_mesh_builder.addConvexPolygonExtrusion(
self._hull.getPoints()[::-1], # bottom layer is reversed
self._mesh_height-thickness, self._mesh_height, color=self._color):
hull_mesh = hull_mesh_builder.build()
self.setMeshData(hull_mesh)
def getHull(self):
return self._hull
def getThickness(self):
return self._thickness
def getWatchedNode(self):
return self._node
def render(self, renderer):
if not ConvexHullNode.shader:
ConvexHullNode.shader = OpenGL.getInstance().createShaderProgram(Resources.getPath(Resources.Shaders, "transparent_object.shader"))
ConvexHullNode.shader.setUniformValue("u_diffuseColor", self._color)
ConvexHullNode.shader.setUniformValue("u_opacity", 0.6)
if self.getParent():
if self.getMeshData():
renderer.queueNode(self, transparent = True, shader = ConvexHullNode.shader, backface_cull = True, sort = -8)
if self._convex_hull_head_mesh:
renderer.queueNode(self, shader = ConvexHullNode.shader, transparent = True, mesh = self._convex_hull_head_mesh, backface_cull = True, sort = -8)
return True
def _onNodeDecoratorsChanged(self, node):
convex_hull_head = self._node.callDecoration("getConvexHullHead")
if convex_hull_head:
convex_hull_head_builder = MeshBuilder()
convex_hull_head_builder.addConvexPolygon(convex_hull_head.getPoints(), self._mesh_height - self._thickness)
self._convex_hull_head_mesh = convex_hull_head_builder.build()
if not node:
return
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