From 62e5efe87b5663ac63cc02253ea5d2b5e38d5d3f Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Wed, 10 Jun 2020 07:28:06 -0700
Subject: [PATCH] SGroups should be considered to have resolution (0, 0)

---
 manimlib/mobject/types/surface.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/manimlib/mobject/types/surface.py b/manimlib/mobject/types/surface.py
index 35d3a3a7..ead93b72 100644
--- a/manimlib/mobject/types/surface.py
+++ b/manimlib/mobject/types/surface.py
@@ -115,6 +115,8 @@ class ParametricSurface(Mobject):
         s_points, du_points, dv_points = self.get_surface_points_and_nudged_points()
         tri_indices = self.get_triangle_indices()
         data = self.get_blank_shader_data_array(len(tri_indices))
+        if len(tri_indices) == 0:
+            return data
         data["point"] = s_points[tri_indices]
         data["du_point"] = du_points[tri_indices]
         data["dv_point"] = dv_points[tri_indices]
@@ -129,6 +131,10 @@ class ParametricSurface(Mobject):
 
 
 class SGroup(ParametricSurface):
+    CONFIG = {
+        "resolution": (0, 0),
+    }
+
     def __init__(self, *parametric_surfaces, **kwargs):
         # TODO, separate out the surface type...again
         super().__init__(uv_func=None, **kwargs)
@@ -137,6 +143,9 @@ class SGroup(ParametricSurface):
     def init_points(self):
         pass
 
+    def get_triangle_indices(self):
+        return np.zeros(0)
+
 
 class TexturedSurface(ParametricSurface):
     CONFIG = {