From d6c2fa8f52371484de0040fe383972e865c69d83 Mon Sep 17 00:00:00 2001
From: Forrest Li <forrest.li@kitware.com>
Date: Fri, 7 Aug 2020 13:29:45 -0400
Subject: [PATCH] fix(OpenGL/ImageMapper): Reset texture format for pwf

---
 Sources/Rendering/OpenGL/ImageMapper/index.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Sources/Rendering/OpenGL/ImageMapper/index.js b/Sources/Rendering/OpenGL/ImageMapper/index.js
index c6c5595e6e6..1cf4c5eda2b 100644
--- a/Sources/Rendering/OpenGL/ImageMapper/index.js
+++ b/Sources/Rendering/OpenGL/ImageMapper/index.js
@@ -716,6 +716,8 @@ function vtkOpenGLImageMapper(publicAPI, model) {
       const pwfSize = pwfWidth * textureHeight;
       const pwfTable = new Uint8Array(pwfSize);
       let pwfun = actorProperty.getPiecewiseFunction();
+      // support case where pwfun is added/removed
+      model.pwfTexture.resetFormatAndType();
       if (pwfun) {
         const pwfFloatTable = new Float32Array(pwfSize);
         const tmpTable = new Float32Array(pwfWidth);