ThreeDScene displaying elements in wrong position in the 3D space #4517
Description
Description of bug / unexpected behavior
The ThreeDScene is displaying the elements in the wrong position in the 3D space when creating and tranforming the various elements.
Expected behavior
The elements must be placed on their right spot in the 3D space when created. Not in front (look at the gif)
How to reproduce the issue
Code for reproducing the problem
from manim import *
import numpy as np
# Configuration for custom dimensions
#config.pixel_width = 640
#config.pixel_height = 308
class PartialDerivative2(ThreeDScene):
def construct(self):
# Camera configuration
self.camera.background_color = WHITE
# Initial camera position
self.set_camera_orientation(phi=70 * DEGREES, theta=-45 * DEGREES)
# Create 3D axes
axes = ThreeDAxes(
x_range=[-5, 5, 1],
y_range=[-5, 5, 1],
z_range=[-5, 5, 1],
x_length=8,
y_length=8,
z_length=6,
axis_config={"color": GRAY, "include_tip": True, "tip_width": 0.15, "tip_height": 0.15}
)
# Axis labels
x_label = axes.get_x_axis_label(Tex("$x$", color=BLACK).scale(0.6))
y_label = axes.get_y_axis_label(Tex("$y$", color=BLACK).scale(0.6))
z_label = axes.get_z_axis_label(Tex("$z$", color=BLACK).scale(0.6))
# Create surface with color gradient
# Function: z = -(1/3)*(x² + 2*y²) + 1.5
surface = Surface(
lambda u, v: axes.c2p(u, v, -(1/3) * (u**2 + 2*v**2) + 1.5),
u_range=[-3.5, 3.5],
v_range=[-2.5, 2.5],
resolution=(40, 40),
fill_opacity=0.85,
checkerboard_colors=[BLUE_D, BLUE_E],
stroke_color=BLUE
)
surface.set_sheen_direction(UP)
surface.set_color_by_gradient(BLUE, PURPLE)
# Reference point (x0, y0)
x0 = 1.5
y0 = 0.8
z0 = -(1/3) * (x0**2 + 2*y0**2) + 1.5
# Vertical plane at y = y0 (plane parallel to xz plane)
plane_width = 7
plane_height = 6
# ValueTracker for the full plane
plane_tracker = ValueTracker(-4)
# Create full plane (from bottom to top) with always_redraw
plane_full = always_redraw(
lambda: Surface(
lambda u, v: axes.c2p(u, y0, v),
u_range=[-3.5, 3.5],
v_range=[-4, plane_tracker.get_value()],
resolution=(20, 20),
fill_color=GRAY,
fill_opacity=0.4
)
)
# Create clipped plane (only up to the surface)
def clipped_plane_func(u, v):
x = u
z_surface = -(1/3) * (x**2 + 2*y0**2) + 1.5
z = min(v, z_surface) # Limit z to the surface height
return axes.c2p(x, y0, z)
# Static clipped plane (will be created later)
plane_clipped = Surface(
lambda u, v: clipped_plane_func(u, v),
u_range=[-3.5, 3.5],
v_range=[-4, 3],
resolution=(50, 50),
fill_color=GRAY,
fill_opacity=0.4,
stroke_width=0.5,
stroke_color=GRAY
)
# Dashed lines
# Line from (x0, y0, 0) to projection on x axis
dashed_line_x = DashedLine(
start=axes.c2p(x0, y0, 0),
end=axes.c2p(x0, 0, 0),
color=BLACK,
stroke_width=2,
dash_length=0.1
)
# Line from (x0, y0, 0) to projection on y axis
dashed_line_y = DashedLine(
start=axes.c2p(x0, y0, 0),
end=axes.c2p(0, y0, 0),
color=BLACK,
stroke_width=2,
dash_length=0.1
)
# Vertical line from (x0, y0, 0) to (x0, y0, z0)
dashed_line_z = DashedLine(
start=axes.c2p(x0, y0, 0),
end=axes.c2p(x0, y0, z0),
color=BLACK,
stroke_width=2,
dash_length=0.1
)
# Labels for x0 and y0 on the axes
x0_label = Tex("$x_0$", color=BLACK).scale(0.5)
x0_label.rotate(PI/2, axis=RIGHT)
x0_label.rotate(-PI/4, axis=OUT)
x0_label.move_to(axes.c2p(x0, -0.5, 0))
y0_label = Tex("$y_0$", color=BLACK).scale(0.5)
y0_label.rotate(PI/2, axis=RIGHT)
y0_label.rotate(-PI/4, axis=OUT)
y0_label.move_to(axes.c2p(-0.5, y0, 0))
# Label (x0, y0) at base point
point_label = Tex("$(x_0, y_0)$", color=BLACK).scale(0.5)
point_label.rotate(PI/2, axis=RIGHT)
point_label.rotate(-PI/4, axis=OUT)
point_label.move_to(axes.c2p(x0, y0, -0.8))
# Animation: Scene construction
self.play(Create(axes), run_time=1.5,)
self.add_fixed_in_frame_mobjects(x_label, y_label, z_label)
self.wait(0.5)
# Display the surface
self.play(Create(surface), run_time=2)
self.wait(0.5)
# Display the dashed lines
self.play(
Create(dashed_line_x),
Create(dashed_line_y),
run_time=1
)
self.wait(0.3)
# Display labels x0, y0
self.add(x0_label, y0_label)
self.wait(0.3)
# Display the label (x0, y0)
self.add(point_label)
self.wait(0.5)
# Display the vertical dashed line
self.play(Create(dashed_line_z), run_time=0.8)
self.wait(0.5)
# Display the full plane
self.add(plane_full)
self.play(plane_tracker.animate.set_value(3), run_time=1.5)
# Replace with a static plane
self.remove(plane_full)
plane_full_static = Surface(
lambda u, v: axes.c2p(u, y0, v),
u_range=[-3.5, 3.5],
v_range=[-4, 3],
resolution=(20, 20),
fill_color=GRAY,
fill_opacity=0.4
)
self.add(plane_full_static)
self.wait(1)
# Transition: clip the plane
self.play(
Transform(plane_full_static, plane_clipped),
run_time=1.5
)
self.wait(2)
# Rotate camera for better view
self.begin_ambient_camera_rotation(rate=0.1)
self.wait(3)
self.stop_ambient_camera_rotation()
self.wait(2)Additional media files
Images/GIFs
Logs
Terminal output
PASTE HERE OR PROVIDE LINK TO https://pastebin.com/ OR SIMILAR
System specifications
System Details
- Manim version v19.1 - OS (with version, e.g., Windows 10 v2004 or macOS 10.15 (Catalina)): Windows 11 - RAM: 32GB - Python version (`python/py/python3 --version`): 3.12 - Installed modules (provide output from `pip list`): ``` PASTE HERE ```LaTeX details
- LaTeX distribution (e.g. TeX Live 2020):
- Installed LaTeX packages: