1 files changed, 73 insertions, 0 deletions
diff --git a/Source/Graphics/modelsurfacewalker.h b/Source/Graphics/modelsurfacewalker.h
new file mode 100644
index 00000000..e1e66f51
--- /dev/null
+++ b/Source/Graphics/modelsurfacewalker.h
@@ -0,0 +1,73 @@
+//-----------------------------------------------------------------------------
+//           Name: modelsurfacewalker.h
+//      Developer: Wolfire Games LLC
+//    Description: 
+//        License: Read below
+//-----------------------------------------------------------------------------
+//
+//
+//   Copyright 2022 Wolfire Games LLC
+//
+//   Licensed under the Apache License, Version 2.0 (the "License");
+//   you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+//   Unless required by applicable law or agreed to in writing, software
+//   distributed under the License is distributed on an "AS IS" BASIS,
+//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+//   limitations under the License.
+//
+//-----------------------------------------------------------------------------
+#pragma once
+
+#include <Math/vec3.h>
+#include <Math/vec2.h>
+
+#include <opengl.h>
+
+#include <vector>
+
+struct MSWTriInfo {
+    int neighbors[3];
+    float edge_length[3];
+    bool edge_swapped[3];
+    MSWTriInfo();
+};
+
+struct SurfaceWalker {
+    enum Type {BLOOD, WATER, FIRE};
+    int on_edge;
+    int tri;
+    int last_tri;
+    vec3 pos;
+    float amount;
+    float delay;
+    bool can_drip;
+    Type type;
+    SurfaceWalker();
+};
+
+struct SWresults {
+    float dist_moved;
+    int at_point;
+    SWresults();
+};
+
+struct WalkLine {
+    int tri;
+    vec3 start;
+    vec3 end;
+};
+
+class ModelSurfaceWalker {
+public:
+    std::vector<MSWTriInfo> tri_info; // Neighbors and edge lengths of each triangle
+    void AttachTo(const std::vector<float> &vertices, const std::vector<unsigned> &faces);
+    int GetNeighbor( int tri, int neighbor );
+    SWresults Move( SurfaceWalker& sw, vec3* points, const vec3& dir, float drip_dist, std::vector<WalkLine>* trace );
+};
+
+vec3 bary_coords(const vec2 &p, const vec2 &a, const vec2 &b, const vec2&c);