diff -r 4cc6b582fde8 -r 1536f23cfab7 src/gl/compiler.cpp
--- a/src/gl/compiler.cpp	Wed Jan 22 22:43:28 2020 +0200
+++ b/src/gl/compiler.cpp	Thu Jan 23 00:29:10 2020 +0200
@@ -97,8 +97,9 @@
 			object.vertexArray.bind();
 			object.program->enableAttributeArray(0);
 			object.program->enableAttributeArray(1);
-			object.program->setAttributeBuffer(0, GL_FLOAT, 0, 3);
-			object.program->setAttributeBuffer(1, GL_FLOAT, 3, 4);
+			constexpr int stride = 7 * sizeof(GLfloat);
+			object.program->setAttributeBuffer(0, GL_FLOAT, 0 * sizeof(GLfloat), 3, stride);
+			object.program->setAttributeBuffer(1, GL_FLOAT, 3 * sizeof(GLfloat), 4, stride);
 			object.vertexArray.release();
 			object.buffer.release();
 			object.program->release();
@@ -179,8 +180,6 @@
 	for (unsigned int i = 0; i < polygon.numPolygonVertices(); i += 1)
 	{
 		Point3D& point = polygon.vertices[i];
-		polygon.vertices[i].y = -polygon.vertices[i].y;
-		polygon.vertices[i].z = -polygon.vertices[i].z;
 		this->boundingBox.consider(polygon.vertices[i]);
 		vertexBuffer.push_back(static_cast<GLfloat>(point.x));
 		vertexBuffer.push_back(static_cast<GLfloat>(point.y));