Abstract correcting object extents

example/book.odin

@@ -33,9 +33,7 @@ setup_book :: proc(s: ^State_Book, program: gl.Program) {
 	vertices := obj.object_to_triangles(data, data.objects[0], context.allocator)
 
 	s.positions = vertices.pos[:len(vertices)]
-	for &pos in s.positions {
-		pos *= 1000
-	}
+	correct_extents(s.positions, ..get_extents(s.positions), -200, 200)
 
 	s.colors = make([]rgba, len(vertices))
 	for &col, i in s.colors {

example/chair.odin

@@ -35,10 +35,6 @@ setup_chair :: proc(s: ^State_Chair, program: gl.Program) {
 	}
 
 	extent_min, extent_max := get_extents(data.positions[:])
-	extent_span := hypot(extent_max-extent_min)
-
-	goal_min, goal_max: vec3 = -200, 200
-	goal_span := hypot(goal_max-goal_min)
 
 	objects: [dynamic]Object
 
@@ -48,13 +44,10 @@ setup_chair :: proc(s: ^State_Chair, program: gl.Program) {
 
 		o.vao = gl.CreateVertexArray()
 
-		lines := obj.object_to_triangles(data, object, context.allocator)
+		vertices := obj.object_to_triangles(data, object, context.allocator)
 
-		o.positions = lines.pos[:len(lines)]
-		for &pos in o.positions {
-			pos -= (extent_max-extent_min)/2 + extent_min
-			pos *= goal_span/extent_span
-		}
+		o.positions = vertices.pos[:len(vertices)]
+		correct_extents(o.positions, extent_min, extent_max, -200, 200)
 
 		o.colors = make([]rgba, len(o.positions))
 		slice.fill(o.colors, rand_color())
@@ -71,8 +64,6 @@ setup_chair :: proc(s: ^State_Chair, program: gl.Program) {
 
 	/* Init rotation */
 	s.rotation = 1
-
-
 }
 
 @private

example/suzanne.odin

@@ -28,11 +28,9 @@ setup_suzanne :: proc(s: ^State_Suzanne, program: gl.Program) {
 	}
 
 	lines := obj.object_to_lines(data, data.objects[0], context.allocator)
-
+	
 	s.positions = lines.pos[:len(lines)]
-	for &pos in s.positions {
-		pos *= 100
-	}
+	correct_extents(s.positions, ..get_extents(s.positions), -200, 200)
 
 	s.colors = make([]rgba, len(s.positions))
 	slice.fill(s.colors, GREEN)

example/utils.odin

@@ -402,6 +402,20 @@ get_extents :: proc (positions: []$T) -> (v_min, v_max: T) {
 	return
 }
 
+correct_extents :: proc (
+	positions: []vec3,
+	in_min:  vec3, in_max:  vec3,
+	out_min: vec3, out_max: vec3,
+) {
+	in_span  := hypot(in_max-in_min)
+	out_span := hypot(out_max-out_min)
+
+	for &pos in positions {
+		pos -= (in_max-in_min)/2 + in_min
+		pos *= out_span/in_span
+	}
+}
+
 vec3_on_radius :: proc (r, a, y: f32) -> vec3 {
 	return {r * cos(a), y, r * sin(a)}
 }