From 23cdf871c1f6b1bb49311d295370314f2669fc14 Mon Sep 17 00:00:00 2001
From: Remco Burema <r.burema@ultimaker.com>
Date: Thu, 7 May 2020 18:55:55 +0200
Subject: [PATCH] Add comments: Why a matrix4x4 and not a sampler1d?

part of CURA-7426
---
 plugins/SimulationView/SimulationView.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/plugins/SimulationView/SimulationView.py b/plugins/SimulationView/SimulationView.py
index 7a3fde494d..3d824197ac 100644
--- a/plugins/SimulationView/SimulationView.py
+++ b/plugins/SimulationView/SimulationView.py
@@ -317,6 +317,8 @@ class SimulationView(CuraView):
             self.currentLayerNumChanged.emit()
 
     def getExtruderOpacities(self) -> Matrix:
+        # NOTE: Extruder opacities are stored in a matrix for (minor) performance reasons (w.r.t. OpenGL/shaders).
+        # If more than 16 extruders are called for, this should be converted to a sampler1d.
         return Matrix(self._extruder_opacity)
 
     def setShowTravelMoves(self, show):