commit 93aa7e5a21a28c223cc6e12d8d0736fcb96e1bfc
Author: Leszek Koltunski <leszek@koltunski.pl>
Date:   Sat Jun 6 17:58:55 2020 +0100

    Do NOT sett viewport to (500,500) when pre-appllying vertex effects as that causes the first (few?) frames the pre-applied Mesh is displayed to be displayed in a wrong place on the screen.

diff --git a/src/main/java/org/distorted/library/main/DistortedLibrary.java b/src/main/java/org/distorted/library/main/DistortedLibrary.java
index a18007b..f0e4f02 100644
--- a/src/main/java/org/distorted/library/main/DistortedLibrary.java
+++ b/src/main/java/org/distorted/library/main/DistortedLibrary.java
@@ -481,8 +481,6 @@ public class DistortedLibrary
     {
     if( mFullProgram!=null )
       {
-      GLES30.glViewport(0, 0, 500, 500 ); // this is fine, we don't need viewport at all
-
       int num = mesh.getNumVertices();
       int tfo = mesh.getTFO();