diff --git a/.gitignore b/.gitignore
index f7576aa..48a2ab8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,7 @@
 
 *.c.o
 *.c.d
+
+Doxyfile
+
+*.tar.xz
diff --git a/Makefile b/Makefile
index 02e3cbb..ea2437e 100644
--- a/Makefile
+++ b/Makefile
@@ -22,8 +22,8 @@ arflags :=
 target := libfxengine.a
 
 # Automatic names for object and dependency files
-src2obj = $(1:../src/%=src/%).o
-src2dep = $(1:../src/%=src/%).d
+src2obj = $(1:src/%=build/%).o
+src2dep = $(1:src/%=build/%).d
 
 # Source files
 src      := $(shell find src \
@@ -64,15 +64,15 @@ $(target): $(obj)
 	$(call cmd_l,ar,$@) $(ar) rcs $(arflags) $@ $^
 
 # Assembler sources
-src/%.s.o: src/%.s src/%.s.d
+build/%.s.o: src/%.s build/%.s.d
 	@ mkdir -p $(dir $@)
 	$(call cmd_b,as,$*.s) $(gcc) -c $< -o $@ $(sflags)
-src/%.S.o: src/%.S src/%.S.d
+build/%.S.o: src/%.S build/%.S.d
 	@ mkdir -p $(dir $@)
 	$(call cmd_b,as,$*.S) $(gcc) -c $< -o $@ $(sflags)
 
 # C sources
-src/%.c.o: src/%.c src/%.c.d
+build/%.c.o: src/%.c build/%.c.d
 	@ mkdir -p $(dir $@)
 	$(call cmd_b,gcc,$*.c) $(gcc) -c $< -o $@ $(dflags) $(cflags)
 
@@ -124,8 +124,8 @@ uninstall:
 
 # Dependency information
 -include $(shell [ -d src ] && find src -name *.d)
-src/%.d: ;
-.PRECIOUS: src/%.d
+build/%.d: ;
+.PRECIOUS: build/%.d
 
 .PHONY: all clean distclean
 
diff --git a/include/fxengine/render/triangle.h b/include/fxengine/render/triangle.h
index dc97bf7..42ae493 100644
--- a/include/fxengine/render/triangle.h
+++ b/include/fxengine/render/triangle.h
@@ -5,11 +5,6 @@
 #include <fxengine/render/bitmap.h>
 #include <stdbool.h>
 
-/**
- * @brief Regulates the maximum fps count to 30 fps
- */
-#define MINIMUM_FRAME_DELAY 3333
-
 /**
  * @brief      Triangle struct used to render fonctions
  * @param[out] part       choose the used texture half
diff --git a/include/fxengine/render/zbuffer.h b/include/fxengine/render/zbuffer.h
index 47371f9..34beee6 100644
--- a/include/fxengine/render/zbuffer.h
+++ b/include/fxengine/render/zbuffer.h
@@ -16,6 +16,6 @@ void render_zbuffer_clear();
  * retourne true si il faut dessiner le pixel
  * retourne false si le pixel est déjà existant
 **/
-bool render_zbuffer_set_px(uint32_t x, uint32_t y, uint32_t dist); // if you are allowed to draw the pixel on vram
+bool render_zbuffer_set_px(const uint32_t x, const uint32_t y, const uint32_t dist); // if you are allowed to draw the pixel on vram
 
 #endif
diff --git a/libfxengine.a b/libfxengine.a
index 850b3a5..9cdf5ce 100644
Binary files a/libfxengine.a and b/libfxengine.a differ
diff --git a/src/render/triangle.c b/src/render/triangle.c
index 85f4f34..94bd5d7 100644
--- a/src/render/triangle.c
+++ b/src/render/triangle.c
@@ -192,24 +192,23 @@ void render_display_triangle(const render_triangle * face)
 
         for (int32_t x=txmin; x<=txmax; x++)
         {
-            double vx, vy, z;
-            const double xcalc = x - face->s1->x, ycalc = y - face->s1->y;
-            // calcul de vx, vy
-            vx=(xcalc*fact_1-ycalc*fact_2); // 0 <vx< 10_000
-            vy=(ycalc*fact_3-xcalc*fact_4); // idem
-            z=face->s1->z + (vx * zAB  +  vy * zAC) / 32768.0;
-            vx /= 32768.0;
-            vy /= 32768.0;
+            int32_t vx, vy, z;
 
-            double vx2= ( vx/face->s2->z ) / ((1-vx)/face->s1->z + vx/face->s2->z);
-            double vy2= ( vy/face->s3->z ) / ((1-vy)/face->s1->z + vy/face->s3->z);
+            const int32_t xcalc = x - face->s1->x, ycalc = y - face->s1->y;
+            // calcul de vx, vy
+            vx = (xcalc*fact_1 - ycalc*fact_2);
+            vy = (ycalc*fact_3 - xcalc*fact_4);
+            z = face->s1->z + (vx * zAB  +  vy * zAC)/32768;
+
+
+            int32_t vx2= ( vx*face->texture->size_px_x/face->s2->z ) / ((32768-vx)/face->s1->z + vx/face->s2->z);
+            int32_t vy2= ( vy*face->texture->size_px_y/face->s3->z ) / ((32768-vy)/face->s1->z + vy/face->s3->z);
             /* Perspective correction
             vx /= (double) face->s2->z / ((1 - vx) / face->s1->z + vx / (double) face->s2->z);
             vy /= (double) face->s3->z / ((1 - vy) / face->s1->z + vy / (double) face->s3->z);
             */
             // Affichage du point
-            const uint8_t color = bitmap_get_pixel_r(face->texture, face->texture->size_px_x * vx2,
-                                                                    face->texture->size_px_y * vy2);
+            const uint8_t color = bitmap_get_pixel_r(face->texture, vx2, vy2);
 
             if (color >> 1)
             {
diff --git a/src/render/zbuffer.c b/src/render/zbuffer.c
index e186483..c4b3e76 100644
--- a/src/render/zbuffer.c
+++ b/src/render/zbuffer.c
@@ -36,7 +36,7 @@ void render_zbuffer_clear()
 
 }
 
-bool render_zbuffer_set_px(uint32_t x, uint32_t y, uint32_t dist)
+bool render_zbuffer_set_px(const uint32_t x, const uint32_t y, const uint32_t dist)
 {
     const int indice = x * render_height + y;