diff --git a/include/app.h b/include/app.h
index a85055b..af04219 100644
--- a/include/app.h
+++ b/include/app.h
@@ -55,12 +55,13 @@ bool chunk_is_block_neighboring_block(Chunk* chunk, vec3i pos);
 void chunk_set_blocks_visibility(Chunk* chunk);
 void chunk_create_displayl(App *app, Chunk *chunk);
 void chunk_render(Chunk* chunk);
-
-void check_intersection_block(App *app, vec3i *retv);
-
-bool is_block(Block b);
+void chunk_update(App *app, Chunk *chunk);
 
 int app_get_current_chunk_index(App *app);
+int check_intersection_block(App *app, vec3i *retv, int *chunk_index);
+void app_break_block(App *app);
+
+bool is_block(Block b);
 
 bool app_check_collision(App *app);
 
diff --git a/include/utils.h b/include/utils.h
index d11d5a5..5b9ec2d 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -46,4 +46,7 @@ bool is_oob(int i, int min, int max);
 
 void mult_matrix(float *matrix, vec4f vector, vec4f *ret);
 
+bool matrix_inverse(const float m[16], float invOut[16]);
+
+void vec3f_normalize(vec3f *v);
 #endif /* UTILS_H */
diff --git a/src/app.c b/src/app.c
index 6d3e7a1..1862dda 100644
--- a/src/app.c
+++ b/src/app.c
@@ -111,8 +111,8 @@ void reshape(GLsizei width, GLsizei height)
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     glFrustum(
-        -.08, .08,
-        -.06, .06,
+        -.16, .16,
+        -.09, .09,
         .1, 1000
     );
 }
@@ -175,13 +175,11 @@ void handle_events(App* app)
             }
             break;
         case SDL_MOUSEBUTTONDOWN:
-            is_mouse_down = true;
+            app_break_block(app);
             break;
         case SDL_MOUSEMOTION:
             SDL_GetMouseState(&x, &y);
-            if (is_mouse_down) {
-                rotate_camera(&(app->camera), mouse_x - x, mouse_y - y);
-            }
+            rotate_camera(&(app->camera), mouse_x - x, mouse_y - y);
             mouse_x = x;
             mouse_y = y;
             break;
@@ -198,18 +196,6 @@ void handle_events(App* app)
 
 }
 
-void app_raycast(App *app)
-{
-    vec4f v = {0, 0, -1, 1};
-    vec4f retv;
-    float projection[16];
-    glGetFloatv(GL_PROJECTION_MATRIX, projection);
-    mult_matrix(projection, v, &retv);
-    retv.z = -1.0;
-    retv.w = 0.0;
-    
-}
-
 void draw_cube(App *app, float x, float y, float z)
 {
     /*x*=2;
@@ -305,7 +291,7 @@ bool app_check_collision(App *app)
             for (int z = 0; z < CHUNK_MAX_Z; z++) {
                 if (!is_block(app->chunks[i].blocks[x][y][z]))
                     continue;
-                if (app->camera.position.z <= z+5)
+                if (app->camera.position.z <= z+3)
                     return true;
             }
         }
@@ -313,37 +299,60 @@ bool app_check_collision(App *app)
     return false;
 }
 
-void check_intersection_block(App *app, vec3i *retv)
+int check_intersection_block(App *app, vec3i *retv, int *chunk_index)
 {
+
+    printf("%s\n", __func__);
     int i = app_get_current_chunk_index(app);
 
+    *chunk_index = i;
     vec3f c_pos = app->camera.position;
     vec3f c_dir = get_camera_dir_vec3f(&app->camera);
 
-    retv->x = 0;
-    retv->y = 0;
-    retv->z = 0;
-    
     if (i < 0)
-        return;
+        return -1;
 
     for (int x = 0; x < CHUNK_MAX_X; x++) {
         for (int y = 0; y < CHUNK_MAX_Y; y++) {
             for (int z = 0; z < CHUNK_MAX_Z; z++) {
-                for (int i = 0; i < 8; i+=0.1) {
-                    vec3f ray = {c_pos.x + c_dir.x * i,
-                                 c_pos.y + c_dir.y * i,
-                                 c_pos.z + c_dir.z * i};
+                if (app->chunks[i].blocks[x][y][z].visible) {
+                    for (float j = 0; j < 8; j+=0.2) {
+                        vec3f ray = {(c_pos.x - app->chunks[i].start_pos.x) + c_dir.x * j,
+                                     (c_pos.y - app->chunks[i].start_pos.y) + c_dir.y * j,
+                                     (c_pos.z - app->chunks[i].start_pos.z) + c_dir.z * j};
+                        printf("ray x: %f y: %f z: %f\n", ray.x, ray.y, ray.z);
+                        vec3i rayi = {round(ray.x/1), round(ray.y/1), round(ray.z/1)};
 
-                    vec3i rayi = {floor(ray.x/1), floor(ray.y/1), floor(ray.z/1)};
-
-                    if (is_block(app->chunks[i].blocks[rayi.x][rayi.y][rayi.z])) {
-                        retv->x = ray.x;
-                        retv->y = ray.y;
-                        retv->z = ray.z;
-                    } 
+                        if (is_block(app->chunks[i].blocks[rayi.x][rayi.y][rayi.z])) {
+                            retv->x = rayi.x;
+                            retv->y = rayi.y;
+                            retv->z = rayi.z;
+                            return 0;
+                        }
+                    }
                 } 
             }
         }
     }
+    return -1;
 }
+
+void app_break_block(App *app)
+{
+    printf("%s\n", __func__);
+    vec3i block;
+    int i;
+    int ret = check_intersection_block(app, &block, &i);
+
+    printf("chunk index: %d\n", i);
+    printf("player x: %f y: %f z: %f\n", app->camera.position.x, app->camera.position.y, app->camera.position.z);
+    printf("chunk %d. min x: %f y: %f max x: %f y: %f\n", i, app->chunks[i].start_pos.x,
+            app->chunks[i].start_pos.y, app->chunks[i].start_pos.x+CHUNK_MAX_X, app->chunks[i].start_pos.y+CHUNK_MAX_Y);
+    printf("broken block x: %f y: %f z: %f\n", block.x+app->chunks[i].start_pos.x, block.y+app->chunks[i].start_pos.y, block.z+app->chunks[i].start_pos.z);
+    if(ret < 0)
+        return;
+
+    app->chunks[i].blocks[block.x][block.y][block.z].type = BLOCKTYPE_AIR;
+    chunk_update(app, &(app->chunks[i]));
+}
+
diff --git a/src/camera.c b/src/camera.c
index 6ae6651..62b3985 100644
--- a/src/camera.c
+++ b/src/camera.c
@@ -40,7 +40,7 @@ void set_view(const Camera* camera)
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
 
-    glRotatef(-(camera->rotation.x), 1.0, 0, 0);
+    glRotatef(-(camera->rotation.x + 90), 1.0, 0, 0);
     glRotatef(-(camera->rotation.z - 90), 0, 0, 1.0);
     glTranslatef(-camera->position.x, -camera->position.y, -camera->position.z);
 }
@@ -67,11 +67,11 @@ void rotate_camera(Camera* camera, double horizontal, double vertical)
     }
 
     if (camera->rotation.x < 0.0) {
-        camera->rotation.x = 0.0;
+        camera->rotation.x += 360.0;
     }
 
-    if (camera->rotation.x > 180.0) {
-        camera->rotation.x = 180.0;
+    if (camera->rotation.x > 360.0) {
+        camera->rotation.x -= 360.0;
     }
 }
 
@@ -90,13 +90,15 @@ void set_camera_side_speed(Camera* camera, double speed)
     camera->speed.x = speed;
 }
 
-vec3f get_camera_dif_vec3f(Camera *camera)
+vec3f get_camera_dir_vec3f(Camera *camera)
 {
-    vec3f dir = {cos(degree_to_radian(camera->rotation.z)) *
-                     cos(degree_to_radian(camera->rotation.x)),
-                     sin(degree_to_radian(camera->rotation.z)) *
-                     cos(degree_to_radian(camera->rotation.x)),
-                     sin(degree_to_radian(camera->rotation.x))};
+    vec3f dir = {cos(degree_to_radian(camera->rotation.x)) *
+                 cos(degree_to_radian(camera->rotation.z)), 
+                 sin(degree_to_radian(camera->rotation.z)) *
+                 cos(degree_to_radian(camera->rotation.x)),
+                 sin(degree_to_radian(camera->rotation.x))};
+
+    vec3f_normalize(&dir);
     return dir;
 }
 
diff --git a/src/game.c b/src/game.c
index 3dcd84d..a692116 100644
--- a/src/game.c
+++ b/src/game.c
@@ -59,3 +59,9 @@ void chunk_render(Chunk* chunk)
 {
     glCallList(chunk->id);
 }
+
+void chunk_update(App *app, Chunk *chunk)
+{
+    chunk_set_blocks_visibility(chunk);
+    chunk_create_displayl(app, chunk); 
+}
diff --git a/src/main.c b/src/main.c
index 553b39f..9c8d615 100644
--- a/src/main.c
+++ b/src/main.c
@@ -53,20 +53,10 @@ int main()
             chunk_render(&chunks[i]);
         }
 
-        vec3f dir = {cos(degree_to_radian(app.camera.rotation.z)) *
-                     cos(degree_to_radian(app.camera.rotation.x)),
-                     sin(degree_to_radian(app.camera.rotation.z)) *
-                     cos(degree_to_radian(app.camera.rotation.x)),
-                     sin(degree_to_radian(app.camera.rotation.x))};
+        // vec3f pos = app.camera.position; 
+        // vec3f dir = get_camera_dir_vec3f(&app.camera);
 
-        vec3f pos = {app.camera.position.x, app.camera.position.y, app.camera.position.z };
-
-        glLineWidth(10);
-        glBegin(GL_LINES);
-            glColor3f(1.0, 0.0, 0.0);
-            glVertex3f(pos.x, pos.y, pos.z);
-            glVertex3f(pos.x+3*dir.x, pos.y+3*dir.y, pos.z+3*dir.z);
-        glEnd();
+        // draw_cube(&app, pos.x + dir.x*3, pos.y + dir.y*3, pos.z + dir.z*3);
 
         SDL_GL_SwapWindow(app.window);
 
@@ -74,10 +64,10 @@ int main()
 
         app.frame_time = calc_frame_time(&start, &end);
 
-        printf("fps: %f\n", 1000/app.frame_time);
+        //printf("fps: %f\n", 1000/app.frame_time);
         //printf("lkat pos x: %f y: %f z: %f\n", pos.x+5*dir.x, pos.y+5*dir.y, pos.z+5*dir.z);
-        printf("camera x: %f y: %f z: %f\n", pos.x, pos.y, pos.z);
-        printf("dir x: %f y: %f z: %f\n", dir.x, dir.y, dir.z);
+        //printf("camera x: %f y: %f z: %f\n", pos.x, pos.y, pos.z);
+        //printf("dir x: %f y: %f z: %f\n", dir.x, dir.y, dir.z);
         //printf("dird x: %f y: %f z: %f\n", app.camera.rotation.x, app.camera.rotation.y, app.camera.rotation.z);
     }
 
diff --git a/src/utils.c b/src/utils.c
index 93ef9f0..453c267 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -1,4 +1,4 @@
-#include "utils.h"
+#include "../include/utils.h"
 
 #include <math.h>
 #include <stdbool.h>
@@ -28,4 +28,143 @@ void mult_matrix(float *matrix, vec4f vector, vec4f *ret)
 		ret1[i/4] = line_sum;
 	}
 	ret->x = ret1[0]; ret->y = ret1[1]; ret->z=ret1[2]; ret->w = ret1[3];
-}
\ No newline at end of file
+}
+
+bool matrix_inverse(const float m[16], float invOut[16])
+{
+
+    float inv[16], det;
+    int i;
+
+    inv[0] = m[5]  * m[10] * m[15] - 
+             m[5]  * m[11] * m[14] - 
+             m[9]  * m[6]  * m[15] + 
+             m[9]  * m[7]  * m[14] +
+             m[13] * m[6]  * m[11] - 
+             m[13] * m[7]  * m[10];
+
+    inv[4] = -m[4]  * m[10] * m[15] + 
+              m[4]  * m[11] * m[14] + 
+              m[8]  * m[6]  * m[15] - 
+              m[8]  * m[7]  * m[14] - 
+              m[12] * m[6]  * m[11] + 
+              m[12] * m[7]  * m[10];
+
+    inv[8] = m[4]  * m[9] * m[15] - 
+             m[4]  * m[11] * m[13] - 
+             m[8]  * m[5] * m[15] + 
+             m[8]  * m[7] * m[13] + 
+             m[12] * m[5] * m[11] - 
+             m[12] * m[7] * m[9];
+
+    inv[12] = -m[4]  * m[9] * m[14] + 
+               m[4]  * m[10] * m[13] +
+               m[8]  * m[5] * m[14] - 
+               m[8]  * m[6] * m[13] - 
+               m[12] * m[5] * m[10] + 
+               m[12] * m[6] * m[9];
+
+    inv[1] = -m[1]  * m[10] * m[15] + 
+              m[1]  * m[11] * m[14] + 
+              m[9]  * m[2] * m[15] - 
+              m[9]  * m[3] * m[14] - 
+              m[13] * m[2] * m[11] + 
+              m[13] * m[3] * m[10];
+
+    inv[5] = m[0]  * m[10] * m[15] - 
+             m[0]  * m[11] * m[14] - 
+             m[8]  * m[2] * m[15] + 
+             m[8]  * m[3] * m[14] + 
+             m[12] * m[2] * m[11] - 
+             m[12] * m[3] * m[10];
+
+    inv[9] = -m[0]  * m[9] * m[15] + 
+              m[0]  * m[11] * m[13] + 
+              m[8]  * m[1] * m[15] - 
+              m[8]  * m[3] * m[13] - 
+              m[12] * m[1] * m[11] + 
+              m[12] * m[3] * m[9];
+
+    inv[13] = m[0]  * m[9] * m[14] - 
+              m[0]  * m[10] * m[13] - 
+              m[8]  * m[1] * m[14] + 
+              m[8]  * m[2] * m[13] + 
+              m[12] * m[1] * m[10] - 
+              m[12] * m[2] * m[9];
+
+    inv[2] = m[1]  * m[6] * m[15] - 
+             m[1]  * m[7] * m[14] - 
+             m[5]  * m[2] * m[15] + 
+             m[5]  * m[3] * m[14] + 
+             m[13] * m[2] * m[7] - 
+             m[13] * m[3] * m[6];
+
+    inv[6] = -m[0]  * m[6] * m[15] + 
+              m[0]  * m[7] * m[14] + 
+              m[4]  * m[2] * m[15] - 
+              m[4]  * m[3] * m[14] - 
+              m[12] * m[2] * m[7] + 
+              m[12] * m[3] * m[6];
+
+    inv[10] = m[0]  * m[5] * m[15] - 
+              m[0]  * m[7] * m[13] - 
+              m[4]  * m[1] * m[15] + 
+              m[4]  * m[3] * m[13] + 
+              m[12] * m[1] * m[7] - 
+              m[12] * m[3] * m[5];
+
+    inv[14] = -m[0]  * m[5] * m[14] + 
+               m[0]  * m[6] * m[13] + 
+               m[4]  * m[1] * m[14] - 
+               m[4]  * m[2] * m[13] - 
+               m[12] * m[1] * m[6] + 
+               m[12] * m[2] * m[5];
+
+    inv[3] = -m[1] * m[6] * m[11] + 
+              m[1] * m[7] * m[10] + 
+              m[5] * m[2] * m[11] - 
+              m[5] * m[3] * m[10] - 
+              m[9] * m[2] * m[7] + 
+              m[9] * m[3] * m[6];
+
+    inv[7] = m[0] * m[6] * m[11] - 
+             m[0] * m[7] * m[10] - 
+             m[4] * m[2] * m[11] + 
+             m[4] * m[3] * m[10] + 
+             m[8] * m[2] * m[7] - 
+             m[8] * m[3] * m[6];
+
+    inv[11] = -m[0] * m[5] * m[11] + 
+               m[0] * m[7] * m[9] + 
+               m[4] * m[1] * m[11] - 
+               m[4] * m[3] * m[9] - 
+               m[8] * m[1] * m[7] + 
+               m[8] * m[3] * m[5];
+
+    inv[15] = m[0] * m[5] * m[10] - 
+              m[0] * m[6] * m[9] - 
+              m[4] * m[1] * m[10] + 
+              m[4] * m[2] * m[9] + 
+              m[8] * m[1] * m[6] - 
+              m[8] * m[2] * m[5];
+
+    det = m[0] * inv[0] + m[1] * inv[4] + m[2] * inv[8] + m[3] * inv[12];
+
+    if (det == 0)
+        return false;
+
+    det = 1.0 / det;
+
+    for (i = 0; i < 16; i++)
+        invOut[i] = inv[i] * det;
+
+    return true;
+}
+
+void vec3f_normalize(vec3f *v)
+{
+    float w = sqrt(v->x * v->x + v->y * v->y + v->z * v->z);
+    v->x /= w;
+    v->y /= w;
+    v->z /= w;
+}