Better previews

core/assets/shaders/planetgrid.vertex.glsl

@@ -0,0 +1,12 @@
+attribute vec4 a_position;
+attribute vec4 a_color;
+
+uniform mat4 u_projModelView;
+varying vec4 v_col;
+varying vec4 v_position;
+
+void main() {
+    gl_Position = u_projModelView * a_position;
+    v_col = a_color;
+    v_position = a_position;
+}