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Remember triangle indices, rather than recomputing each frame

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This commit is contained in:
Grant Sanderson 2020-06-15 12:02:24 -07:00
parent c45fe52a70
commit e6f73073fe
1 changed files with 20 additions and 9 deletions
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29
manimlib/mobject/types/surface.py
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@ -6,6 +6,7 @@ from manimlib.mobject.mobject import Mobject
from manimlib.utils.bezier import interpolate
from manimlib.utils.color import color_to_rgba
from manimlib.utils.color import rgb_to_hex
from manimlib.utils.config_ops import digest_config
from manimlib.utils.images import get_full_raster_image_path
from manimlib.utils.space_ops import normalize_along_axis
@ -40,7 +41,9 @@ class ParametricSurface(Mobject):
}
def __init__(self, uv_func, **kwargs):
digest_config(self, kwargs)
self.uv_func = uv_func
self.compute_triangle_indices()
super().__init__(**kwargs)
def init_points(self):
@ -64,17 +67,25 @@ class ParametricSurface(Mobject):
# are still easily recoverable.
self.points = np.vstack(point_lists)
def get_triangle_indices(self):
def compute_triangle_indices(self):
# TODO, if there is an event which changes
# the resolution of the surface, make sure
# this is called.
nu, nv = self.resolution
if nu == 0 and nv == 0:
return np.zeros(0, dtype=int)
index_grid = np.arange(nu * nv).reshape((nu, nv))
result = np.zeros(6 * (nu - 1) * (nv - 1), dtype=int)
result[0::6] = index_grid[:-1, :-1].flatten() # Top left
result[1::6] = index_grid[+1:, :-1].flatten() # Bottom left
result[2::6] = index_grid[:-1, +1:].flatten() # Top right
result[3::6] = index_grid[:-1, +1:].flatten() # Top right
result[4::6] = index_grid[+1:, :-1].flatten() # Bottom left
result[5::6] = index_grid[+1:, +1:].flatten() # Bottom right
return result
indices = np.zeros(6 * (nu - 1) * (nv - 1), dtype=int)
indices[0::6] = index_grid[:-1, :-1].flatten() # Top left
indices[1::6] = index_grid[+1:, :-1].flatten() # Bottom left
indices[2::6] = index_grid[:-1, +1:].flatten() # Top right
indices[3::6] = index_grid[:-1, +1:].flatten() # Top right
indices[4::6] = index_grid[+1:, :-1].flatten() # Bottom left
indices[5::6] = index_grid[+1:, +1:].flatten() # Bottom right
self.triangle_indices = indices
def get_triangle_indices(self):
return self.triangle_indices
def init_colors(self):
self.set_color(self.color, self.opacity)