From 715d4879fdd096ac82367984fdb22117d48737a4 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 15 Feb 2023 02:26:06 +0000
Subject: First cut of the model factory and the hardcoded Brush 47 model

Requires temporary change to the fragment shader to hardcode some visible colour to the model
---
 assetFactory/faceController.cpp | 53 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 assetFactory/faceController.cpp

(limited to 'assetFactory/faceController.cpp')

diff --git a/assetFactory/faceController.cpp b/assetFactory/faceController.cpp
new file mode 100644
index 0000000..bdef74b
--- /dev/null
+++ b/assetFactory/faceController.cpp
@@ -0,0 +1,53 @@
+#include "faceController.h"
+#include "assetFactoryConfig.h"
+#include "maths.h"
+
+void
+FaceController::apply(ModelFactoryMesh & mesh, const std::string & name, Shape::CreatedFaces & faces) const
+{
+	if (!type.empty()) {
+		const auto mutation = getMatrix();
+		const auto controlledFacesRange = faces.equal_range(name);
+		const std::vector controlledFaces(controlledFacesRange.first, controlledFacesRange.second);
+		faces.erase(name);
+		for (const auto & cf : controlledFaces) {
+			// get face vertices
+			const auto faceVertexRange = mesh.fv_range(cf.second);
+			// get points
+			const std::vector baseVertices(faceVertexRange.begin(), faceVertexRange.end());
+			std::vector<glm::vec3> points;
+			std::transform(
+					faceVertexRange.begin(), faceVertexRange.end(), std::back_inserter(points), [&mesh](auto && v) {
+						return mesh.point(v);
+					});
+			const auto vertexCount = points.size();
+			const auto centre
+					= std::accumulate(points.begin(), points.end(), glm::vec3 {}) / static_cast<float>(vertexCount);
+			if (type == "extrude") {
+				Shape::CreatedFaces newFaces;
+				// mutate points
+				std::for_each(points.begin(), points.end(), [&mutation, &centre](auto && p) {
+					p = centre + ((p - centre) % mutation);
+				});
+				// create new vertices
+				std::vector<OpenMesh::VertexHandle> vertices;
+				std::transform(points.begin(), points.end(), std::back_inserter(vertices), [&mesh](auto && p) {
+					return mesh.add_vertex({p.x, p.y, p.z});
+				});
+				// create new faces
+
+				mesh.delete_face(cf.second);
+				for (size_t idx {}; idx < vertexCount; ++idx) {
+					const auto next = (idx + 1) % vertexCount;
+					newFaces.emplace("extrusion",
+							mesh.add_face({baseVertices[idx], baseVertices[next], vertices[next], vertices[idx]}));
+				}
+				newFaces.emplace(name, mesh.add_face(vertices));
+				for (const auto & [name, faceController] : faceControllers) {
+					faceController.apply(mesh, name, newFaces);
+				}
+				faces.merge(std::move(newFaces));
+			}
+		}
+	}
+}
-- 
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