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Lighthouse now also stable under camera rotations

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This commit is contained in:
Ben Hambrecht
2018-02-17 20:09:09 +01:00
parent 79fe27a16e
commit 75fd78cefc
1 changed files with 21 additions and 5 deletions
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26
topics/light.py
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@@ -185,8 +185,14 @@ class LightSource(VMobject):
self.spotlight.radius = new_radius
def update(self):
M = z_to_vector(self.spotlight.projection_direction())
R = np.array([[0,-1,0],[1,0,0],[0,0,1]])
self.rotation_matrix = np.dot(M,R)
self.spotlight.update_sectors()
self.update_shadow()
self.update_lighthouse()
def get_source_point(self):
return self.source_point.get_location()
@@ -208,8 +214,10 @@ class LightSource(VMobject):
np.reshape(projected_source,(1,3)),
axis = 0
)
rotation_matrix = z_to_vector(self.spotlight.projection_direction())
back_rotation_matrix = rotation_matrix.T # i. e. its inverse
rotation_matrix_here = z_to_vector(self.spotlight.projection_direction())
# self.rotation matrix contains an extra 90 degree rotation
# (this is apparently necessary to orient the lighthouse)
back_rotation_matrix = rotation_matrix_here.T # i. e. its inverse
rotated_point_cloud_3d = np.dot(projected_point_cloud_3d,back_rotation_matrix.T)
# these points now should all have z = 0
@@ -234,7 +242,7 @@ class LightSource(VMobject):
hull_mobject = VMobject()
hull_mobject.set_points_as_corners(hull)
hull_mobject.apply_matrix(rotation_matrix)
hull_mobject.apply_matrix(rotation_matrix_here)
anchors = hull_mobject.get_anchors()
@@ -260,6 +268,13 @@ class LightSource(VMobject):
self.shadow.mark_paths_closed = True
def update_lighthouse(self):
new_lh = Lighthouse().move_to(ORIGIN)
new_lh.apply_matrix(self.rotation_matrix)
new_lh.shift(self.get_source_point())
self.lighthouse.submobjects = new_lh.submobjects
class SwitchOn(LaggedStart):
CONFIG = {
@@ -299,6 +314,7 @@ class Lighthouse(SVGMobject):
def move_to(self,point):
self.next_to(point, DOWN, buff = 0)
return self
class AmbientLight(VMobject):
@@ -393,14 +409,14 @@ class AmbientLight(VMobject):
class Spotlight(VMobject):
CONFIG = {
"source_point": VectorizedPoint(location = ORIGIN, stroke_width = 0, fill_opacity = 0),
"source_point" : VectorizedPoint(location = ORIGIN, stroke_width = 0, fill_opacity = 0),
"opacity_function" : lambda r : 1.0/(r/2+1.0)**2,
"color" : LIGHT_COLOR,
"max_opacity" : 1.0,
"num_levels" : 10,
"radius" : 5.0,
"screen" : None,
"camera": None
"camera" : None
}
def projection_direction(self):