diff -r ee5758ddb6d2 -r 8e1fe64ce4e3 src/gl/vertexprogram.cpp
--- a/src/gl/vertexprogram.cpp	Sat Jun 11 15:20:24 2022 +0300
+++ b/src/gl/vertexprogram.cpp	Sun Jun 12 20:47:04 2022 +0300
@@ -120,12 +120,12 @@
 	this->fragmentStyle = newFragmentStyle;
 }
 
-void VertexProgram::build(const EditorTabWidget *document)
+void VertexProgram::build(const VertexMap* vertexMap)
 {
 	constexpr glm::vec3 color = {0.0, 1.0, 1.0};
 	this->data.clear();
 	const std::vector<glm::vec3> sphere = ::sphere(8 / 2);
-	document->applyToVertices([&](const glm::vec3&, const VertexMap::VertexInfo& info)
+	vertexMap->apply([&](const glm::vec3&, const VertexMap::VertexInfo& info)
 	{
 		reserveMore(this->data, sphere.size());
 		for (const glm::vec3& point : sphere)