Use proper real world scale for the car

assets/car_convex.obj

@@ -1,31 +1,31 @@
-# Blender 4.3.2
+# Blender 4.4.0
 # www.blender.org
 o Object_5
-v -1.859343 0.407766 2.882677
+v -0.809354 0.177497 1.254802
-v -1.496358 -0.439898 4.246497
+v -0.651350 -0.191484 1.848460
-v -1.532271 -0.014560 4.306011
+v -0.666983 -0.006338 1.874366
-v -1.458925 0.588598 4.098169
+v -0.635056 0.256211 1.783894
-v -1.169193 1.844997 -0.020979
+v -0.508939 0.803110 -0.009132
-v -1.767808 0.808841 -2.967643
+v -0.769510 0.352081 -1.291787
-v -1.755688 0.019238 -3.954955
+v -0.764234 0.008374 -1.721554
-v 1.566465 -0.437912 4.228478
+v 0.681867 -0.190619 1.840616
-v -1.355442 0.201413 4.442485
+v -0.590011 0.087673 1.933771
-v -1.527377 -0.513372 -3.070427
+v -0.664853 -0.223466 -1.336528
-v -1.081991 -0.669592 2.507292
+v -0.470980 -0.291467 1.091400
-v 1.152275 -0.667651 2.498548
+v 0.501574 -0.290622 1.087594
-v -1.177522 1.915790 -2.273865
+v -0.512564 0.833925 -0.989792
-v -1.440784 1.165512 -4.710642
+v -0.627160 0.507336 -2.050498
-v -1.567565 0.052245 -5.155589
+v -0.682346 0.022742 -2.244179
-v 1.558806 0.207560 4.426651
+v 0.678533 0.090349 1.926879
-v 1.597780 -0.511147 -3.072741
+v 0.695498 -0.222497 -1.337535
-v 1.825968 0.019292 -3.954931
+v 0.794826 0.008397 -1.721544
-v 1.929686 0.407656 2.882679
+v 0.839974 0.177449 1.254803
-v 1.529256 0.593033 4.083607
+v 0.665671 0.258142 1.777555
-v 1.239481 1.844996 -0.020995
+v 0.539534 0.803109 -0.009139
-v 1.247809 1.915789 -2.273863
+v 0.543159 0.833925 -0.989791
-v 1.511068 1.165512 -4.710640
+v 0.657754 0.507336 -2.050497
-v 1.637697 0.053622 -5.155048
+v 0.712874 0.023341 -2.243943
-v 1.838094 0.808837 -2.967645
+v 0.800105 0.352079 -1.291788
 s 0
 f 1 2 3
 f 1 3 4

game/game.odin

@@ -322,23 +322,23 @@ update_runtime_world :: proc(runtime_world: ^Runtime_World, dt: f32) {
 
 		sim_state := physics.get_sim_state(&world.physics_scene)
 
-		// 1.6 is a good value
+		wheel_extent_x_front := f32(1.355) / 2
-		wheel_extent_x := f32(1.7)
+		wheel_extent_x_back := f32(1.345) / 2
-		wheel_y := f32(-0.5)
+		wheel_y := f32(-0.1)
 		rest := f32(1)
 		natural_frequency := f32(0.35)
 		damping := f32(0.07)
-		radius := f32(0.6)
+		radius := f32(0.2888)
-		wheel_front_z := f32(3.05)
+		wheel_front_z := f32(1.3)
-		wheel_back_z := f32(-2.45)
+		wheel_back_z := f32(-1.1)
-		wheel_mass := f32(12)
+		wheel_mass := f32(30)
 
 		wheel_fl := physics.immediate_suspension_constraint(
 			&world.physics_scene,
 			&runtime_world.solver_state,
 			#hash("FL", "fnv32a"),
 			{
-				rel_pos = {-wheel_extent_x, wheel_y, wheel_front_z},
+				rel_pos = {-wheel_extent_x_front, wheel_y, wheel_front_z},
 				rel_dir = {0, -1, 0},
 				radius = radius,
 				rest = rest,
@@ -353,7 +353,7 @@ update_runtime_world :: proc(runtime_world: ^Runtime_World, dt: f32) {
 			&runtime_world.solver_state,
 			#hash("FR", "fnv32a"),
 			{
-				rel_pos = {wheel_extent_x, wheel_y, wheel_front_z},
+				rel_pos = {wheel_extent_x_front, wheel_y, wheel_front_z},
 				rel_dir = {0, -1, 0},
 				radius = radius,
 				rest = rest,
@@ -368,7 +368,7 @@ update_runtime_world :: proc(runtime_world: ^Runtime_World, dt: f32) {
 			&runtime_world.solver_state,
 			#hash("RL", "fnv32a"),
 			{
-				rel_pos = {-wheel_extent_x, wheel_y, wheel_back_z},
+				rel_pos = {-wheel_extent_x_back, wheel_y, wheel_back_z},
 				rel_dir = {0, -1, 0},
 				radius = radius,
 				rest = rest,
@@ -383,7 +383,7 @@ update_runtime_world :: proc(runtime_world: ^Runtime_World, dt: f32) {
 			&runtime_world.solver_state,
 			#hash("RR", "fnv32a"),
 			{
-				rel_pos = {wheel_extent_x, wheel_y, wheel_back_z},
+				rel_pos = {wheel_extent_x_back, wheel_y, wheel_back_z},
 				rel_dir = {0, -1, 0},
 				radius = radius,
 				rest = rest,
@@ -1093,7 +1093,7 @@ game_memory_size :: proc() -> int {
 game_hot_reloaded :: proc(mem: rawptr) {
 	g_mem = (^Game_Memory)(mem)
 
-	g_mem.runtime_world.orbit_camera.distance = 10
+	g_mem.runtime_world.orbit_camera.distance = 4
 }
 
 @(export)

game/physics/simulation.odin

@@ -514,7 +514,7 @@ pgs_solve_engines :: proc(sim_state: ^Sim_State, config: Solver_Config, dt: f32,
 
 				friction :=
 					math.pow(
-						max(engine.w - rpm_to_angular_velocity(engine.lowest_rpm), 0) * 0.001,
+						max(engine.w - rpm_to_angular_velocity(engine.lowest_rpm), 0) * 0.002,
 						4,
 					) *
 						engine.internal_friction +