diff --git a/Makefile b/Makefile
deleted file mode 100644
index e24766e..0000000
--- a/Makefile
+++ /dev/null
@@ -1,55 +0,0 @@
-EXE = t3dsr
-TEXE = t3dsr_test
-
-INC = include
-SRC = src
-TST = test
-BLD = build
-
-DDIR = $(BLD)/debug
-TDIR = $(BLD)/test
-
-CC = clang
-CFLAGS = -Wall -Wextra -I$(INC) -g
-
-SRCS := $(shell find $(SRC) -name "*.c")
-OBJS := $(SRCS:$(SRC)/%.c=$(DDIR)/%.o)
-
-all: $(EXE)
-.PHONY: all
-
-$(EXE): $(OBJS) | $(DDIR)
-	@$(CC) $^ -o $(BLD)/$@
-
-$(DDIR):
-	@mkdir -p $(DDIR)
-
-$(DDIR)/%.o: $(SRC)/%.c | $(DDIR)
-	@mkdir -p $(dir $@)
-	@$(CC) $(CFLAGS) -c $< -o $@
-
-clean:
-	@rm -rf $(BLD) $(EXE)
-
-run: $(EXE)
-	@./$(BLD)/$(EXE)
-
-TSRCS := $(shell find $(TST) -name "*.c")
-TOBJS := $(TSRCS:$(TST)/%.c=$(TDIR)/%.o) \
-	$(filter-out $(DDIR)/main.o, $(OBJS))
-
-debug:
-	@echo "$(OBJS)\n$(TOBJS)"
-
-$(TDIR)/%.o: $(TST)/%.c | $(TDIR)
-	@mkdir -p $(dir $@)
-	@$(CC) $(CFLAGS) -c $< -o $@
-
-$(TDIR):
-	@mkdir -p $(TDIR)
-
-$(TEXE): $(TOBJS) | $(TDIR) $(DDIR)
-	@$(CC) $^ -o $(BLD)/$@
-
-test: $(TEXE)
-	@./$(BLD)/$(TEXE)
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index bc8fa7c..d96d838 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,4 +1,4 @@
-#include "math/vector3.h"
+#include "math/vec3.h"
 #include <stdio.h>
 
 #define printVector3(v) { printf("(%f, %f, %f)", v.x, v.y, v.z); }
diff --git a/src/math/matrix3.c b/src/math/mat3.c
similarity index 63%
rename from src/math/matrix3.c
rename to src/math/mat3.c
index 3d4843e..6308f61 100644
--- a/src/math/matrix3.c
+++ b/src/math/mat3.c
@@ -1,7 +1,7 @@
-#include "matrix3.h"
+#include "mat3.h"
 #include <string.h>
 
-Mat3 mat3(float arr[9]) 
+Mat3 mat3(const float arr[9]) 
 {
     Mat3 mat;
     memcpy(mat.m, arr, 9*sizeof(float));
@@ -90,30 +90,30 @@ Mat3 mat3_tpo(const Mat3* m)
     return mat;
 }
 
-float mat3_det(const Mat3* m) 
+float mat3_Det(const Mat3* m) 
 {
     return m->m[0] * (m->m[4] * m->m[8] - m->m[5] * m->m[7]) -
            m->m[1] * (m->m[3] * m->m[8] - m->m[5] * m->m[6]) +
            m->m[2] * (m->m[3] * m->m[7] - m->m[4] * m->m[6]);
 }
 
-// Mat3 Mat3Inv(Mat3 m) {
-//     Mat3 inv;
-//     float det = Mat3Det(m);
-//     if (det == 0) return Mat3Ity();
+Mat3 mat3_inv(const Mat3* m) {
+    Mat3 inv;
+    float det = mat3_det(m);
+    if (det == 0) return mat3_ity();
 
-//     float invDet = 1.0f / det;
+    float invDet = 1.0f / det;
 
-//     // ???
-//     inv.m[0] =  (m->m[4] * m->m[8] - m->m[5] * m->m[7]) * invDet;
-//     inv.m[1] = -(m->m[1] * m->m[8] - m->m[2] * m->m[7]) * invDet;
-//     inv.m[2] =  (m->m[1] * m->m[5] - m->m[2] * m->m[4]) * invDet;
-//     inv.m[3] = -(m->m[3] * m->m[8] - m->m[5] * m->m[6]) * invDet;
-//     inv.m[4] =  (m->m[0] * m->m[8] - m->m[2] * m->m[6]) * invDet;
-//     inv.m[5] = -(m->m[0] * m->m[5] - m->m[2] * m->m[3]) * invDet;
-//     inv.m[6] =  (m->m[3] * m->m[7] - m->m[4] * m->m[6]) * invDet;
-//     inv.m[7] = -(m->m[0] * m->m[7] - m->m[1] * m->m[6]) * invDet;
-//     inv.m[8] =  (m->m[0] * m->m[4] - m->m[1] * m->m[3]) * invDet;
+    // ???
+    inv.m[0] =  (m->m[4] * m->m[8] - m->m[5] * m->m[7]) * invDet;
+    inv.m[1] = -(m->m[1] * m->m[8] - m->m[2] * m->m[7]) * invDet;
+    inv.m[2] =  (m->m[1] * m->m[5] - m->m[2] * m->m[4]) * invDet;
+    inv.m[3] = -(m->m[3] * m->m[8] - m->m[5] * m->m[6]) * invDet;
+    inv.m[4] =  (m->m[0] * m->m[8] - m->m[2] * m->m[6]) * invDet;
+    inv.m[5] = -(m->m[0] * m->m[5] - m->m[2] * m->m[3]) * invDet;
+    inv.m[6] =  (m->m[3] * m->m[7] - m->m[4] * m->m[6]) * invDet;
+    inv.m[7] = -(m->m[0] * m->m[7] - m->m[1] * m->m[6]) * invDet;
+    inv.m[8] =  (m->m[0] * m->m[4] - m->m[1] * m->m[3]) * invDet;
 
-//     return inv;
-// }
\ No newline at end of file
+    return inv;
+}
\ No newline at end of file
diff --git a/src/math/matrix3.h b/src/math/mat3.h
similarity index 93%
rename from src/math/matrix3.h
rename to src/math/mat3.h
index af4dcf6..6012452 100644
--- a/src/math/matrix3.h
+++ b/src/math/mat3.h
@@ -6,7 +6,7 @@ typedef struct
     float m[9];
 } Mat3;
 
-Mat3 mat3(float arr[9]);
+Mat3 mat3(const float arr[9]);
 Mat3 mat3_zro();
 Mat3 mat3_ity();
 
diff --git a/src/math/vector3.c b/src/math/vec3.c
similarity index 94%
rename from src/math/vector3.c
rename to src/math/vec3.c
index 2781814..5f980b5 100644
--- a/src/math/vector3.c
+++ b/src/math/vec3.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <float.h>
 
-#include "vector3.h"
+#include "vec3.h"
 
 inline Vec3 vec3(float x, float y, float z) 
 {
@@ -24,11 +24,6 @@ Vec3 vec3_scale(Vec3 v, float scalar)
     return vec3(v.x * scalar, v.y * scalar, v.z * scalar);
 }
 
-Vec3 vec3_mul(Vec3 v1, Vec3 v2)
-{
-    return vec3(v1.x * v2.x, v1.y * v2.y, v1.z * v2.z);
-}
-
 float vec3_dot(Vec3 a, Vec3 b) 
 {
     return a.x * b.x + a.y * b.y + a.z * b.z;
diff --git a/src/math/vector3.h b/src/math/vec3.h
similarity index 100%
rename from src/math/vector3.h
rename to src/math/vec3.h
diff --git a/src/math/vector4.c b/src/math/vec4.c
similarity index 98%
rename from src/math/vector4.c
rename to src/math/vec4.c
index 70cc0b5..8196a15 100644
--- a/src/math/vector4.c
+++ b/src/math/vec4.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <float.h>
 
-#include "vector4.h"
+#include "vec4.h"
 
 inline Vec4 vec4(float x, float y, float z, float w) 
 {
diff --git a/src/math/vector4.h b/src/math/vec4.h
similarity index 100%
rename from src/math/vector4.h
rename to src/math/vec4.h