scale and move to center,

performance is not very good. Takes very long to load

QtMeshViewer/Header/GeometryEngine.h

@@ -27,6 +27,7 @@ private:
 	QOpenGLBuffer m_indexBuf;
 	QVector<QOpenGLTexture*> m_textures;
 	QVector<DrawInformation> m_drawList;
+	BoundingBox m_boundings;
 
 	void loadTexture(const char* filePath);
 	void clearData();

QtMeshViewer/Resources/vshader.glsl

@@ -5,6 +5,7 @@ precision mediump float;
 #endif
 
 uniform mat4 vp_matrix;
+uniform mat4 norm_matrix;
 uniform mat4 m_matrix;
 
 attribute vec4 a_position;
@@ -15,7 +16,7 @@ varying vec2 v_texcoord;
 void main()
 {
 	// Calculate vertex position in screen space
-	gl_Position = vp_matrix * m_matrix * a_position;
+	gl_Position = vp_matrix * norm_matrix * m_matrix * a_position;
 
 	// Pass texture coordinate to fragment shader
 	// Value will be automatically interpolated to fragments inside polygon faces

QtMeshViewer/Source/GeometryEngine.cpp

 #include "..\Header\GeometryEngine.h"
 #include "..\Header\MshFile.h"
+#include <cmath>
 
 
 /////////////////////////////////////////////////////////////////////////
@@ -45,6 +46,7 @@ void GeometryEngine::loadFile(const char* filePath)
 		MshFile file(filePath);
 		models = file.getModels();
 		textureNames = file.getTextureNames();
+		m_boundings = file.getBoundingBox();
 
 		// collect data
 		unsigned int indexOffset(0);
@@ -76,8 +78,6 @@ void GeometryEngine::loadFile(const char* filePath)
 			}
 		}
 
-		//TODO: cleanup old stuff
-
 		// Transfer vertex data to VBO 0
 		m_arrayBuf.bind();
 		m_arrayBuf.allocate(vertexData.data(), vertexData.size() * sizeof(VertexData));
@@ -159,6 +159,13 @@ void GeometryEngine::drawGeometry(QOpenGLShaderProgram *program)
 	m_arrayBuf.bind();
 	m_indexBuf.bind();
 
+	// Allways normalize by this
+	QMatrix4x4 normMatrix;
+	float maxExtent = std::max(std::max(m_boundings.extents[0], m_boundings.extents[1]), m_boundings.extents[2]);
+	normMatrix.scale(1 / maxExtent);
+	normMatrix.translate(-m_boundings.center[0], -m_boundings.center[1], -m_boundings.center[2]);
+	program->setUniformValue("norm_matrix", normMatrix);
+
 	// Allways use texture unit 0
 	program->setUniformValue("texture", 0);
 

QtMeshViewer/Source/OglViewerWidget.cpp

@@ -6,7 +6,7 @@
 #include <math.h>
 #include <iostream>
 
-#define DEFAULT_Z_DISTANCE -5.0
+#define DEFAULT_Z_DISTANCE -4.0
 
 
 /////////////////////////////////////////////////////////////////////////