diff --git a/source/engine/2dphysics.c b/source/engine/2dphysics.c
index 045a1ec..151eb40 100644
--- a/source/engine/2dphysics.c
+++ b/source/engine/2dphysics.c
@@ -9,6 +9,9 @@
 #include "gameobject.h"
 #include <math.h>
 #include <chipmunk/chipmunk_unsafe.h>
+#include "stb_ds.h"
+
+#include "log.h"
 
 cpBody *ballBody = NULL;
 cpSpace *space = NULL;
@@ -454,7 +457,22 @@ void phys2d_dbgdrawedge(struct phys2d_edge *edge)
 	float bd = sqrt(pow(b.x, 2.f) + pow(b.y, 2.f));
 	float aa = atan2(a.y, a.x) + angle;
 	float ba = atan2(b.y, b.x) + angle;
-	draw_line(ad * cos(aa) + p.x, ad * sin(aa) + p.y,
-		  bd * cos(ba) + p.x, bd * sin(ba) + p.y);
+	draw_line(ad * cos(aa) + p.x, ad * sin(aa) + p.y, bd * cos(ba) + p.x, bd * sin(ba) + p.y);
     }
 }
+
+s7_pointer *cbs;
+
+static cpBool s7_phys_cb(cpArbiter *arb, cpSpace *space, void *data) {
+    s7_pointer *cb = data;
+    script_call_sym(*cb);
+}
+
+void phys2d_add_begin_handler(s7_pointer cb) {
+    arrput(cbs, cb);
+    cpCollisionHandler *handler = cpSpaceAddDefaultCollisionHandler(space);
+    handler->userData = &arrlast(cbs);
+    handler->beginFunc = s7_phys_cb;
+
+    YughInfo("Added a phys collider CB.");
+}
\ No newline at end of file
diff --git a/source/engine/2dphysics.h b/source/engine/2dphysics.h
index 89277a8..ce331b7 100644
--- a/source/engine/2dphysics.h
+++ b/source/engine/2dphysics.h
@@ -2,7 +2,7 @@
 #define TWODPHYSICS_H
 
 #include <chipmunk/chipmunk.h>
-
+#include "s7.h"
 
 struct gameobject;
 
@@ -95,6 +95,8 @@ void phys2d_init();
 void phys2d_update(float deltaT);
 void phys2d_apply();
 
+void phys2d_add_begin_handler(s7_pointer cb);
+
 void shape_gui(struct phys2d_shape *shape);
 
 #endif
diff --git a/source/engine/debug/log.c b/source/engine/debug/log.c
index 6cfa210..0c5deae 100644
--- a/source/engine/debug/log.c
+++ b/source/engine/debug/log.c
@@ -50,8 +50,9 @@ void mYughLog(int category, int priority, int line, const char *file, const char
 	    fflush(logfile);
 	}
 
-        snprintf(con+coni, CONSOLE_BUF-coni, "%s\n", buffer);
-        coni += strlen(buffer);
+        int add = snprintf(con+coni, CONSOLE_BUF-coni, "%s\n", buffer);
+        coni += add;
+        if (coni > CONSOLE_BUF) coni = CONSOLE_BUF;
 
         snprintf(lastlog, ERROR_BUFFER, "%s", buffer);
 
diff --git a/source/engine/input.c b/source/engine/input.c
index 1620a8f..1cba45e 100644
--- a/source/engine/input.c
+++ b/source/engine/input.c
@@ -49,11 +49,16 @@ void input_init()
 
 }
 
+void call_input_signal(char *signal) {
+    for (int i = 0; i < arrlen(pawns); i++)
+        script_eval_w_env(signal, pawns[i]);
+}
+
 void call_input_down(int *key) {
     const char *keyname = glfwGetKeyName(*key, 0);
     char keystr[50] = {'\0'};
     snprintf(keystr, 50, "input_%s_down", keyname);
-    script_call(keystr);
+    call_input_signal(keystr);
 }
 
 /* This is called once every frame - or more if we want it more! */
@@ -181,9 +186,7 @@ void win_key_callback(GLFWwindow *w, int key, int scancode, int action, int mods
     }
 
     SCRIPTCALL:
-    for (int i = 0; i < arrlen(pawns); i++)
-        script_eval_w_env(keystr, pawns[i]);
-
+    call_input_signal(keystr);
 }
 
 void cursor_hide()
diff --git a/source/engine/mrbffi.c b/source/engine/mrbffi.c
index 8e21e26..4c44caa 100644
--- a/source/engine/mrbffi.c
+++ b/source/engine/mrbffi.c
@@ -75,7 +75,7 @@ s7_pointer s7_settings_cmd(s7_scheme *sc, s7_pointer args) {
 
 s7_pointer s7_log(s7_scheme *sc, s7_pointer args) {
     int lvl = s7_integer(s7_car(args));
-    const char *msg = s7_string(s7_object_to_string(sc, s7_cadr(args), 0));
+    const char *msg = s7_string(s7_cadr(args));
     const char *file = s7_string(s7_caddr(args));
     int line = s7_integer(s7_cadddr(args));
     mYughLog(1, lvl, line, file, msg);
@@ -193,11 +193,9 @@ s7_pointer s7_gui_hook(s7_scheme *sc, s7_pointer args) {
 
 s7_pointer s7_register(s7_scheme *sc, s7_pointer args) {
     int hook = s7_integer(s7_car(args));
-    s7_pointer expr = s7_cadr(args);
-
     register_update(s7_cadr(args));
 
-    return expr;
+    return args;
 }
 
 s7_pointer s7_set_pawn(s7_scheme *sc, s7_pointer args) {
@@ -230,12 +228,34 @@ s7_pointer s7_set_body(s7_scheme *sc, s7_pointer args) {
 
 s7_pointer s7_set_body_pos(s7_scheme *sc, s7_pointer args) {
     int id = s7_integer(s7_car(args));
-    double x = s7_real(s7_cadr(args));
-    double y = s7_real(s7_caddr(args));
-    gameobject_setpos(get_gameobject_from_id(id), x, y);
+    int cmd = s7_integer(s7_cadr(args));
+    double x = s7_real(s7_caddr(args));
+    double y = s7_real(s7_cadddr(args));
+
+    switch (cmd) {
+        case 0:
+            gameobject_setpos(get_gameobject_from_id(id), x, y);
+            break;
+
+       case 1:
+           gameobject_move(get_gameobject_from_id(id), x, y);
+           break;
+    }
+
     return args;
 }
 
+s7_pointer s7_phys_cmd(s7_scheme *sc, s7_pointer args) {
+    int cmd = s7_integer(s7_car(args));
+    s7_pointer env = s7_cadr(args);
+
+    switch(cmd) {
+        case 0:
+            phys2d_add_begin_handler(env);
+            break;
+    }
+}
+
 #define S7_FUNC(NAME, ARGS) s7_define_function(s7, #NAME, s7_ ##NAME, ARGS, 0, 0, "")
 
 void ffi_load() {
@@ -256,6 +276,7 @@ void ffi_load() {
     S7_FUNC(register, 2);
     S7_FUNC(set_pawn, 1);
     S7_FUNC(set_body, 3);
-    S7_FUNC(set_body_pos, 3);
+    S7_FUNC(set_body_pos, 4);
+    S7_FUNC(phys_cmd, 2);
 }
 
diff --git a/source/engine/script.c b/source/engine/script.c
index 6ca85c9..c204d82 100644
--- a/source/engine/script.c
+++ b/source/engine/script.c
@@ -11,13 +11,36 @@ s7_scheme *s7 = NULL;
 
 s7_pointer *updates;
 
-static void my_print(s7_scheme *sc, uint8_t c, s7_pointer port) {
+static void null_port(s7_scheme *sc, uint8_t c, s7_pointer port) {
+
+}
+
+static void my_err(s7_scheme *sc, uint8_t c, s7_pointer port) {
     static char buffer[1024];
     static char *p = buffer;
-    if (c != '\0' && p != &buffer[1023]) {
+    if (c != '\n' && p != &buffer[1023]) {
         *p = c;
         p++;
     } else {
+        *p = '\0';
+        if (buffer[0] != '\n')
+            YughError(buffer);
+        p = buffer;
+
+        //YughInfo("File %s, line %d", s7_port_filename(sc, port), s7_port_line_number(sc, port));
+
+        int lost = s7_flush_output_port(sc, port);
+    }
+}
+
+static void my_print(s7_scheme *sc, uint8_t c, s7_pointer port) {
+    static char buffer[1024];
+    static char *p = buffer;
+    if (c != '\n' && p != &buffer[1023]) {
+        *p = c;
+        p++;
+    } else {
+         *p = '\0';
         YughInfo(buffer);
         p = buffer;
     }
@@ -25,48 +48,20 @@ static void my_print(s7_scheme *sc, uint8_t c, s7_pointer port) {
 
 void script_init() {
     s7 = s7_init();
-    s7_set_current_error_port(s7, s7_open_output_string(s7));
+    s7_set_current_error_port(s7, s7_open_output_function(s7, my_err));
     s7_set_current_output_port(s7, s7_open_output_function(s7, my_print));
     ffi_load();
 }
 
 void script_run(const char *script) {
-    s7_pointer old_port = s7_set_current_error_port(s7, s7_open_output_string(s7));
-    int gc_loc = -1;
-    if (old_port != s7_nil(s7)) gc_loc = s7_gc_protect(s7, old_port);
-
-
-
-
     s7_eval_c_string(s7, script);
-
-   const char *errmsg = s7_get_output_string(s7, s7_current_error_port(s7));
-
-   if (errmsg && (*errmsg))
-       mYughLog(1, 2, 0, "script", "Scripting error: %s", errmsg);
-
-   s7_close_output_port(s7, s7_current_error_port(s7));
-   s7_set_current_error_port(s7, old_port);
-   if (gc_loc != -1) s7_gc_unprotect_at(s7, gc_loc);
-
 }
 
 int script_dofile(const char *file) {
-/*    static char fload[512];
-    snprintf(fload, 512, "(write (load \"%s\"))", file);
-    s7_eval_c_string(s7, fload);
-    */
     if (!s7_load(s7, file)) {
       YughError("Can't find file %s.", file);
       return 1;
    }
-
-   const char *errmsg = s7_get_output_string(s7, s7_current_error_port(s7));
-
-   if (errmsg && (*errmsg))
-       mYughLog(1, 2, 0, "script", "Scripting error: %s", errmsg);
-
-
     return 0;
 }
 
@@ -89,7 +84,10 @@ void script_call(const char *f) {
 void script_eval_w_env(const char *s, s7_pointer env) {
     char buffer[512];
     snprintf(buffer, 512-1, "(%s)", s);
+
+    s7_set_current_error_port(s7, s7_open_output_function(s7, null_port));
     s7_eval_c_string_with_environment(s7, buffer, env);
+    s7_set_current_error_port(s7, s7_open_output_function(s7, my_err));
 }
 
 void script_call_sym(s7_pointer sym)
diff --git a/source/engine/script.h b/source/engine/script.h
index 077b9f6..31bb5f9 100644
--- a/source/engine/script.h
+++ b/source/engine/script.h
@@ -12,6 +12,7 @@ void script_editor();
 void script_call(const char *f);
 void script_call_sym(s7_pointer sym);
 int script_has_sym(s7_pointer sym);
+void script_eval_w_env(const char *s, s7_pointer env);
 
 void register_update(s7_pointer sym);
 void call_updates();
diff --git a/source/engine/yugine.c b/source/engine/yugine.c
index 87bfdec..68806f1 100644
--- a/source/engine/yugine.c
+++ b/source/engine/yugine.c
@@ -26,7 +26,7 @@ double renderlag = 0;
 double physlag = 0;
 double updatelag = 0;
 
-double renderMS = 1/60.f;
+double renderMS = 1/165.f;
 double physMS = 1/120.f;
 double updateMS = 1/60.f;
 
@@ -135,8 +135,6 @@ int main(int argc, char **args) {
 
     renderMS = 1.0/vidmode->refreshRate;
 
-    double framet = fmin(fmin(renderMS,physMS),updateMS);
-
     script_dofile("scripts/engine.scm");
     script_dofile("config.scm");
 
@@ -150,32 +148,36 @@ int main(int argc, char **args) {
 
     openglInit();
 
-    renderMS = 0.033;
-
     double lastTick;
 
     while (!want_quit()) {
-         double elapsed;
-         elapsed = glfwGetTime() - lastTick;
+         double elapsed = glfwGetTime() - lastTick;
+         deltaT = elapsed;
          lastTick = glfwGetTime();
 
-         //timer_update(lastTick);
+
+         timer_update(lastTick);
 
          call_updates();
 
-         //renderlag += elapsed;
-         //physlag += elapsed;
+         renderlag += elapsed;
+         physlag += elapsed;
+
+         if (physlag >= physMS) {
+             physlag -= physMS;
+             phys2d_update(physMS);
+         }
 
 
         if (renderlag >= renderMS) {
             renderlag -= renderMS;
+            window_renderall();
         }
 
-        window_renderall();
-        input_poll(renderMS- elapsed < 0 ? 0 : renderMS - elapsed);
+
+        double wait = fmax(0, renderMS-elapsed);
+        input_poll(wait);
         window_all_handle_events();
-
-
     }
 
     return 0;
diff --git a/source/scripts/engine.scm b/source/scripts/engine.scm
index 6879901..570f93e 100644
--- a/source/scripts/engine.scm
+++ b/source/scripts/engine.scm
@@ -13,16 +13,21 @@
 (define-macro (funcsrc func)
     `(funcinfo ,func 'source))
 
+(define (objects->string . objs)
+    (apply string-append (map (lambda (obj) (object->string obj #t)) objs)))
+
 (define-macro (glog data lvl)
-    `(log ,lvl ,data (port-filename (current-input-port)) (port-line-number (current-input-port))))
+    (let ((file (*function* (outlet (curlet)) 'file))
+          (line (*function* (outlet (curlet)) 'line)))
+       `(log ,lvl ,data ,file ,line)))
 
 (define-macro (flog data lvl)
     `(log ,lvl ,data (funcinfo (*function*) 'file) (funcinfo (*function*) 'line)))
 
-(define (loginfo data) (glog data 0))
-(define (logwarn data) (glog data 1))
-(define (logerr data) (glog data 2))
-(define (logcrit data) (glog data 3))
+(define (loginfo . data) (glog (objects->string data) 0))
+(define (logwarn . data) (glog (objects->string data) 1))
+(define (logerr . data) (glog (objects->string data) 2))
+(define (logcrit . data) (glog (objects->string data) 3))
 
 (define (set_fps fps) (settings_cmd 0 (/ 1 fps)))
 (define (set_update fps) (settings_cmd 1 (/ 1 fps)))
@@ -68,4 +73,11 @@
     (* deg 0.01745329252))
 
 (define (body_angle! body angle) (set_body body 0 angle))
-(define (body_pos! body x y) (set_body_pos body x y))
+(define (body_pos! body x y) (set_body_pos body 0 x y))
+(define (body_move! body x y) (set_body_pos body 1 x y))
+
+(define-macro (collide . expr)
+    (let ((f (gensym)))
+        `(begin
+	    (define (,f) (begin . ,expr))
+	    (phys_cmd 0 ,f))))