added conversion script

convert.py

@@ -0,0 +1,67 @@
+#!/bin/python3
+
+# ./convert.py model.obj > model.js
+# Converts .obj to a js file that contains a vertex list and a face list.
+# The video below uses an OBJ that is converted to this javascript file and a wireframe is rendered. I wanted to replicate it. 
+# https://www.youtube.com/watch?v=qjWkNZ0SXfo 
+
+# you can translate the model 
+# ./convert.py model.obj 0 -0.5 0 > model.js
+#                        ^   ^  ^
+#                        X   Y  Z
+
+import sys
+
+def parse_obj(path, x_translation, y_translation, z_translation):
+    vertices = []
+    faces = []
+
+    with open(path, "r") as f:
+        for line in f:
+            if line.startswith("v "):
+                _, x, y, z = line.split()
+                vertices.append(
+                        (
+                            # v′ = v + t
+                            # this lets us move the model during conversion.
+                         (float(x) + x_translation),
+                         (float(y) + y_translation),
+                         (float(z) + z_translation)
+                         ))
+
+            elif line.startswith("f "):
+                parts = line.split()[1:]
+                face = []
+                for p in parts:
+                    # Handles v, v/vt, v/vt/vn
+                    idx = int(p.split("/")[0]) - 1
+                    face.append(idx)
+
+                # Triangulate quads/ngons
+                for i in range(1, len(face) - 1):
+                    faces.append([face[0], face[i], face[i + 1]])
+
+    return vertices, faces
+
+
+def main():
+
+    if len(sys.argv) > 2:
+        # pass file and translations into func
+        vs, fs = parse_obj(sys.argv[1], float(sys.argv[2]), float(sys.argv[3]), float(sys.argv[4]))
+    else:
+        vs, fs = parse_obj(sys.argv[1], 0, 0, 0)
+
+    #  output js format to pipe into a js file.
+    print("const vs = [")
+    for v in vs:
+        print(f"  {{x: {v[0]:.6f}, y: {v[1]:.6f}, z: {v[2]:.6f}}},")
+    print("];\n")
+
+    print("const fs = [")
+    for f in fs:
+        print(f"  [{f[0]}, {f[1]}, {f[2]}],")
+    print("];")
+
+if (__name__ == "__main__"):
+    main()