migrated to sol2

decomposed method

added vector2, vector4

refactored tests

added opengl engine to lua

added other engines

added source tests

removed tons of lua files

tests/lua/vector3_test.lua

@@ -0,0 +1,55 @@
+local a = omath.Vec3.new(1, 0, 0)
+local b = omath.Vec3.new(0, 1, 0)
+
+-- Operators
+local c = a + b
+local d = a - b
+local e = a * 2.0
+local f = -a
+print("a + b = " .. tostring(c))
+print("a - b = " .. tostring(d))
+print("a * 2 = " .. tostring(e))
+print("-a    = " .. tostring(f))
+print("a == Vec3(1,2,3): " .. tostring(a == omath.Vec3.new(1, 2, 3)))
+print("a < b: " .. tostring(a < b))
+
+-- Field access + mutation
+print("c.x = " .. c.x .. ", c.y = " .. c.y .. ", c.z = " .. c.z)
+c.x = 99
+print("c.x after mutation = " .. c.x)
+
+-- Methods
+print("a:length()       = " .. a:length())
+print("a:length_2d()    = " .. a:length_2d())
+print("a:length_sqr()   = " .. a:length_sqr())
+print("a:normalized()   = " .. tostring(a:normalized()))
+print("a:dot(b)         = " .. a:dot(b))
+print("a:cross(b)       = " .. tostring(a:cross(b)))
+print("a:distance_to(b) = " .. a:distance_to(b))
+print("a:distance_to_sqr(b) = " .. a:distance_to_sqr(b))
+print("a:abs()          = " .. tostring(a:abs()))
+print("a:sum()          = " .. a:sum())
+print("a:sum_2d()       = " .. a:sum_2d())
+print("a:point_to_same_direction(b) = " .. tostring(a:point_to_same_direction(b)))
+print("a:is_perpendicular(b) = " .. tostring(a:is_perpendicular(b)))
+
+-- angle_between
+local angle, err = a:angle_between(b)
+if angle then
+    print("angle_between = " .. angle .. " degrees")
+else
+    print("angle_between error: " .. err)
+end
+
+-- Zero vector edge case
+local zero = omath.Vec3.new(0, 0, 0)
+local ang2, err2 = zero:angle_between(a)
+if ang2 then
+    print("zero angle = " .. ang2)
+else
+    print("zero angle error: " .. err2)
+end
+
+-- as_table
+local t = a:as_table()
+print("as_table: x=" .. t.x .. " y=" .. t.y .. " z=" .. t.z)