Added DotCloud type

manimlib/mobject/types/dot_cloud.py

@@ -0,0 +1,90 @@
+import numpy as np
+import moderngl
+import numbers
+
+from manimlib.constants import GREY_C
+from manimlib.constants import ORIGIN
+from manimlib.mobject.types.point_cloud_mobject import PMobject
+from manimlib.mobject.geometry import DEFAULT_DOT_RADIUS
+from manimlib.utils.bezier import interpolate
+from manimlib.utils.color import color_to_rgba
+from manimlib.utils.iterables import stretch_array_to_length
+
+
+class DotCloud(PMobject):
+    CONFIG = {
+        "radii": DEFAULT_DOT_RADIUS,
+        "color": GREY_C,
+        "opacity": 1,
+        "vert_shader_file": "true_dot_vert.glsl",
+        "geom_shader_file": "true_dot_geom.glsl",
+        "frag_shader_file": "true_dot_frag.glsl",
+        "render_primitive": moderngl.POINTS,
+        "shader_dtype": [
+            ('point', np.float32, (3,)),
+            ('radius', np.float32, (1,)),
+            ('color', np.float32, (4,)),
+        ],
+    }
+
+    def __init__(self, points=[[ORIGIN]], radii=DEFAULT_DOT_RADIUS, **kwargs):
+        self.radii = np.repeat([radii], len(points))
+        self.points = np.array(points)
+        super().__init__(**kwargs)
+
+    def init_points(self):
+        pass
+
+    def init_colors(self):
+        self.rgbas = np.zeros((len(self.points), 4))
+        self.rgbas[:] = color_to_rgba(self.color, self.opacity)
+        return self
+
+    def set_points(self, points):
+        super().set_points(points)
+        self.radii = stretch_array_to_length(self.radii, len(points))
+        return self
+
+    def set_points_by_grid(self, n_rows, n_cols, height=None, width=None):
+        new_points = np.zeros((n_rows * n_cols, 3))
+        new_points[:, 0] = np.tile(range(n_cols), n_rows)
+        new_points[:, 1] = np.repeat(range(n_rows), n_cols)
+        new_points[:, 2] = 0
+        self.set_points(new_points)
+
+        radius = self.radii[0]
+        if height is None:
+            height = n_rows * 3 * radius
+        if width is None:
+            width = n_cols * 3 * radius
+
+        self.set_height(height, stretch=True)
+        self.set_width(width, stretch=True)
+        self.center()
+
+        return self
+
+    def set_radii(self, radii):
+        if isinstance(radii, numbers.Number):
+            self.radii[:] = radii
+        else:
+            self.radii = stretch_array_to_length(radii, len(self.points))
+        return self
+
+    def scale(self, scale_factor, scale_radii=True, **kwargs):
+        super().scale(scale_factor, **kwargs)
+        if scale_radii:
+            self.radii *= scale_factor
+        return self
+
+    def interpolate(self, mobject1, mobject2, alpha, *args, **kwargs):
+        super().interpolate(mobject1, mobject2, alpha, *args, **kwargs)
+        self.radii = interpolate(mobject1.radii, mobject2.radii, alpha)
+        return self
+
+    def get_shader_data(self):
+        data = self.get_blank_shader_data_array(len(self.points))
+        data["point"] = self.points
+        data["radius"] = self.radii.reshape((len(self.radii), 1))
+        data["color"] = self.rgbas
+        return data

manimlib/mobject/types/point_cloud_mobject.py

@@ -8,10 +8,6 @@ from manimlib.utils.iterables import stretch_array_to_length
 
 
 class PMobject(Mobject):
-    CONFIG = {
-        "stroke_width": DEFAULT_STROKE_WIDTH,
-    }
-
     def reset_points(self):
         self.rgbas = np.zeros((0, 4))
         self.points = np.zeros((0, 3))
@@ -20,6 +16,11 @@ class PMobject(Mobject):
     def get_array_attrs(self):
         return Mobject.get_array_attrs(self) + ["rgbas"]
 
+    def set_points(self, points):
+        self.points = points
+        self.rgbas = stretch_array_to_length(self.rgbas, len(points))
+        return self
+
     def add_points(self, points, rgbas=None, color=None, alpha=1):
         """
         points must be a Nx3 numpy array, as must rgbas if it is not None
@@ -40,23 +41,25 @@ class PMobject(Mobject):
         self.rgbas = np.vstack([self.rgbas, rgbas])
         return self
 
-    def set_color(self, color=YELLOW_C, family=True):
+    def set_color(self, color, family=True):
         rgba = color_to_rgba(color)
         mobs = self.family_members_with_points() if family else [self]
         for mob in mobs:
             mob.rgbas[:, :] = rgba
-        self.color = color
         return self
 
-    def get_stroke_width(self):
-        return self.stroke_width
-
-    def set_stroke_width(self, width, family=True):
+    def set_opacity(self, opacity, family=True):
         mobs = self.family_members_with_points() if family else [self]
         for mob in mobs:
-            mob.stroke_width = width
+            mob.rgbas[:, 3] = opacity
         return self
 
+    def get_color(self):
+        return rgba_to_color(self.rgbas[0, :])
+
+    def get_all_rgbas(self):
+        return self.get_merged_array("rgbas")
+
     # def set_color_by_gradient(self, start_color, end_color):
     def set_color_by_gradient(self, *colors):
         self.rgbas = np.array(list(map(
@@ -87,9 +90,8 @@ class PMobject(Mobject):
             )
         return self
 
-    def match_colors(self, mobject):
-        Mobject.align_data(self, mobject)
-        self.rgbas = np.array(mobject.rgbas)
+    def match_colors(self, pmobject):
+        self.rgbas[:] = stretch_array_to_length(pmobject.rgbas, len(self.points))
         return self
 
     def filter_out(self, condition):
@@ -123,15 +125,6 @@ class PMobject(Mobject):
             mob.apply_over_attr_arrays(lambda arr: arr[indices])
         return self
 
-    def fade_to(self, color, alpha):
-        self.rgbas = interpolate(self.rgbas, color_to_rgba(color), alpha)
-        for mob in self.submobjects:
-            mob.fade_to(color, alpha)
-        return self
-
-    def get_all_rgbas(self):
-        return self.get_merged_array("rgbas")
-
     def ingest_submobjects(self):
         attrs = self.get_array_attrs()
         arrays = list(map(self.get_merged_array, attrs))
@@ -140,9 +133,6 @@ class PMobject(Mobject):
         self.set_submobjects([])
         return self
 
-    def get_color(self):
-        return rgba_to_color(self.rgbas[0, :])
-
     def point_from_proportion(self, alpha):
         index = alpha * (self.get_num_points() - 1)
         return self.points[index]
@@ -157,23 +147,14 @@ class PMobject(Mobject):
         )
 
     def interpolate_color(self, mobject1, mobject2, alpha):
-        self.rgbas = interpolate(
-            mobject1.rgbas, mobject2.rgbas, alpha
-        )
-        self.set_stroke_width(interpolate(
-            mobject1.get_stroke_width(),
-            mobject2.get_stroke_width(),
-            alpha,
-        ))
+        self.rgbas = interpolate(mobject1.rgbas, mobject2.rgbas, alpha)
         return self
 
-    def pointwise_become_partial(self, mobject, a, b):
-        lower_index, upper_index = [
-            int(x * mobject.get_num_points())
-            for x in (a, b)
-        ]
+    def pointwise_become_partial(self, pmobject, a, b):
+        lower_index = int(a * pmobject.get_num_points())
+        upper_index = int(b * pmobject.get_num_points())
         for attr in self.get_array_attrs():
-            full_array = getattr(mobject, attr)
+            full_array = getattr(pmobject, attr)
             partial_array = full_array[lower_index:upper_index]
             setattr(self, attr, partial_array)
 

manimlib/shaders/true_dot_frag.glsl

@@ -0,0 +1,31 @@
+#version 330
+
+uniform vec3 light_source_position;
+uniform float gloss;
+uniform float shadow;
+uniform float anti_alias_width;
+
+in vec4 color;
+in float radius;
+in vec2 center;
+in vec2 point;
+
+out vec4 frag_color;
+
+#INSERT add_light.glsl
+
+void main() {
+    vec2 diff = point - center;
+    float dist = length(diff);
+    vec3 normal = vec3(diff / radius, sqrt(1 - (dist * dist) / (radius * radius)));
+    float signed_dist = dist - radius;
+    frag_color = add_light(
+        color,
+        vec3(point.xy, 0.0),
+        normal,
+        light_source_position,
+        gloss,
+        shadow
+    );
+    frag_color.a *= smoothstep(0.5, -0.5, signed_dist / anti_alias_width);
+}

manimlib/shaders/true_dot_geom.glsl

@@ -0,0 +1,44 @@
+#version 330
+
+layout (points) in;
+layout (triangle_strip, max_vertices = 4) out;
+
+// Needed for get_gl_Position
+uniform vec2 frame_shape;
+uniform float focal_distance;
+uniform float is_fixed_in_frame;
+uniform float anti_alias_width;
+
+in vec3 v_point[1];
+in float v_radius[1];
+in vec4 v_color[1];
+
+out vec4 color;
+out float radius;
+out vec2 center;
+out vec2 point;
+
+// Imports
+#INSERT get_gl_Position.glsl
+
+void main() {
+    color = v_color[0];
+    radius = v_radius[0];
+    center = v_point[0].xy;
+    
+    radius = v_radius[0] / max(1.0 - v_point[0].z / focal_distance / frame_shape.y, 0.0);
+    float rpa = radius + anti_alias_width;
+
+    for(int i = 0; i < 4; i++){
+        // To account for perspective
+
+        int x_index = 2 * (i % 2) - 1;
+        int y_index = 2 * (i / 2) - 1;
+        vec3 corner = v_point[0] + vec3(x_index * rpa, y_index * rpa, 0.0);
+
+        gl_Position = get_gl_Position(corner);
+        point = corner.xy;
+        EmitVertex();
+    }
+    EndPrimitive();
+}

manimlib/shaders/true_dot_vert.glsl

@@ -0,0 +1,23 @@
+#version 330
+
+uniform vec2 frame_shape;
+uniform float anti_alias_width;
+uniform mat4 to_screen_space;
+uniform float is_fixed_in_frame;
+uniform float focal_distance;
+
+in vec3 point;
+in float radius;
+in vec4 color;
+
+out vec3 v_point;
+out float v_radius;
+out vec4 v_color;
+
+#INSERT position_point_into_frame.glsl
+
+void main(){
+    v_point = position_point_into_frame(point);
+    v_radius = radius;
+    v_color = color;
+}