Bootstrap LegoLOD, implement/match ViewManager::FUN_100a66a0 (#625)

* Bootstrap LegoLOD, implement/match ViewManager::FUN_100a66a0

* Fixes

* Try fix

* Try this

* Fix

LEGO1/viewmanager/viewlod.h

@@ -0,0 +1,32 @@
+#include "decomp.h"
+#include "realtime/roi.h"
+#include "tgl/tgl.h"
+
+//////////////////////////////////////////////////////////////////////////////
+// ViewLOD
+//
+
+// VTABLE: LEGO1 0x100dbd70
+// SIZE 0x0c
+class ViewLOD : public LODObject {
+public:
+	ViewLOD(Tgl::Renderer* pRenderer) : m_meshGroup(NULL), m_unk0x08(3) {}
+	~ViewLOD() override;
+
+	// FUNCTION: LEGO1 0x100a6f30
+	double AveragePolyArea() const override { return 2 * 3.14159 * 10.0 / NumPolys(); } // vtable+0x04
+
+	// FUNCTION: LEGO1 0x100a6f50
+	int NVerts() const override { return NumPolys() * 2; } // vtable+0x08
+
+	Tgl::Group* GetGeometry() { return m_meshGroup; }
+	const Tgl::Group* GetGeometry() const { return m_meshGroup; }
+
+	// SYNTHETIC: LEGO1 0x100a6f60
+	// ViewLOD::`scalar deleting destructor'
+
+protected:
+	// TODO: m_meshGroup unconfirmed (based on 1996)
+	Tgl::Group* m_meshGroup; // 0x04
+	undefined4 m_unk0x08;    // 0x08
+};