diff --git a/engine/src/client.c b/engine/src/client.c
index b31d292..ff33c15 100644
--- a/engine/src/client.c
+++ b/engine/src/client.c
@@ -98,17 +98,6 @@ void GSClientDestroy(GSClient client) {
 
 static void scene(GSClient client) {
 	if(client->engine->param->render != NULL) client->engine->param->render(client->engine);
-
-	GSVector3 n   = {0, 1, 0};
-	GSVector3 q[] = {
-	    {-3, -1, 3},
-	    {-3, -1, -3},
-	    {3, -1, -3},
-	    {3, -1, 3}};
-
-	GSGLTextureSet(client->gl, 2);
-	GSGLPolygon(client->gl, 4, q, NULL, n);
-	GSGLTextureSet(client->gl, 0);
 }
 
 void GSClientStep(GSClient client) {
diff --git a/engine/src/math.c b/engine/src/math.c
index a26b894..c4890bc 100644
--- a/engine/src/math.c
+++ b/engine/src/math.c
@@ -54,8 +54,8 @@ void GSMathAdd3(GSVector3 r, GSVector3 v0, GSVector3 v1) {
 void GSMathNormal3x3(GSVector3 r, GSVector3 v0, GSVector3 v1, GSVector3 v2) {
 	GSVector3 t0, t1;
 
-	GSMathSubtract3(t0, v1, v0);
-	GSMathSubtract3(t1, v2, v0);
+	GSMathSubtract3(t0, v1, v2);
+	GSMathSubtract3(t1, v0, v2);
 
 	GSMathCross3(r, t0, t1);
 
diff --git a/engine/src/model.c b/engine/src/model.c
index 2648b6e..fdf1db1 100644
--- a/engine/src/model.c
+++ b/engine/src/model.c
@@ -147,8 +147,8 @@ static void parse_obj(GSModel model, char* txt) {
 						}
 					}
 
-					if(c == 3) GSMathNormal3x3(face.normal, face.vertex[2], face.vertex[1], face.vertex[0]);
-					if(c == 4) GSMathNormal3x4(face.normal, face.vertex[3], face.vertex[2], face.vertex[1], face.vertex[0]);
+					if(c == 3) GSMathNormal3x3(face.normal, face.vertex[0], face.vertex[1], face.vertex[2]);
+					if(c == 4) GSMathNormal3x4(face.normal, face.vertex[0], face.vertex[1], face.vertex[2], face.vertex[3]);
 
 					arrput(model->face, face);
 				}