From 90f6b74bf4799bcdbf27c46a19de2db08be00f73 Mon Sep 17 00:00:00 2001
From: Sven Oesau <sven.oesau@geometryfactory.com>
Date: Fri, 8 Aug 2025 12:01:12 +0200
Subject: [PATCH] revert changes to shader_spheres.vert removing unused
 function

---
 Lab/demo/Lab/Scene_spheres_item.cpp        | 5 -----
 Lab/demo/Lab/Scene_spheres_item.h          | 1 -
 Lab/demo/Lab/resources/shader_spheres.vert | 6 +++---
 3 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/Lab/demo/Lab/Scene_spheres_item.cpp b/Lab/demo/Lab/Scene_spheres_item.cpp
index 6afc47a14e6..d65da606030 100644
--- a/Lab/demo/Lab/Scene_spheres_item.cpp
+++ b/Lab/demo/Lab/Scene_spheres_item.cpp
@@ -327,11 +327,6 @@ QMenu* Scene_spheres_item::contextMenu() {
   return menu;
 }
 
-float Scene_spheres_item::alpha() const
-{
-  return Scene_item_rendering_helper::alpha();
-}
-
 QString
 Scene_spheres_item::toolTip() const {
     return d->tooltip;
diff --git a/Lab/demo/Lab/Scene_spheres_item.h b/Lab/demo/Lab/Scene_spheres_item.h
index 2944a7f5d5f..23ae7fe541f 100644
--- a/Lab/demo/Lab/Scene_spheres_item.h
+++ b/Lab/demo/Lab/Scene_spheres_item.h
@@ -60,7 +60,6 @@ public:
   bool save(const std::string &file_name) const;
 
   QMenu *contextMenu() override;
-  float alpha() const override;
 
   void initializeBuffers(Viewer_interface *) const override;
   void computeElements() const override;
diff --git a/Lab/demo/Lab/resources/shader_spheres.vert b/Lab/demo/Lab/resources/shader_spheres.vert
index c6778a1288b..68b0babf8a0 100644
--- a/Lab/demo/Lab/resources/shader_spheres.vert
+++ b/Lab/demo/Lab/resources/shader_spheres.vert
@@ -1,7 +1,7 @@
 #version 150
 in vec4 vertex;
 in vec3 normals;
-in vec4 colors;
+in vec3 colors;
 in vec3 center;
 in float radius;
 uniform mat4 mvp_matrix;
@@ -19,7 +19,7 @@ void main(void)
   gl_PointSize = point_size;
   for(int i=0; i<6; ++i)
     dist[i] = 1.0;
-  color = colors;
+  color = vec4(colors, 1.0);
   vec4 transformed_vertex =
       vec4(radius*vertex.x + center.x, radius* vertex.y + center.y, radius*vertex.z + center.z, 1.0);
   fP = mv_matrix * transformed_vertex;
@@ -27,6 +27,6 @@ void main(void)
   norm_matrix_3[0] = norm_matrix[0].xyz;
   norm_matrix_3[1] = norm_matrix[1].xyz;
   norm_matrix_3[2] = norm_matrix[2].xyz;
-  fN = norm_matrix_3 * normals;
+  fN = norm_matrix_3* normals;
   gl_Position =  mvp_matrix * f_matrix * transformed_vertex;
 }