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### Yaw and velocity Posted: Tue May 21, 2019 10:08
I want to set a yawn for an entity and want to increase the velocity in that yaw. My knowledge of trigonometry is terrible. :-/

Code: Select all
`local yaw = clicker:get_look_horizontal()self.object:set_yaw(yaw) --the mob has to runaway in the same way that the clickerself.object:set_velocity( ????? )`

### Re: Yaw and velocity Posted: Tue May 21, 2019 11:51
Code: Select all
`lookat=function(self,pos2)   local pos1=self.object:get_pos()   local vec = {x=pos1.x-pos2.x, y=pos1.y-pos2.y, z=pos1.z-pos2.z}   local yaw = math.atan(vec.z/vec.x)-math.pi/2   if pos1.x >= pos2.x then yaw = yaw+math.pi end   self.object:set_yaw(yaw)endwalk=function(self,speed)   local yaw = self.object:get_yaw()   local speed = speed or 1   local x = math.sin(yaw) * -1   local z = math.cos(yaw) * 1   local y = self.object:get_velocity().y   self.object:set_velocity({      x = x*speed,      y = y,      z = z*speed   })   return selfendrun_away=function(self,pos)   lookat(self,pos)   self.object:get_yaw()   self.object:set_yaw(yaw+math.pi)   walk(self,2)end`

### Re: Yaw and velocity Posted: Tue May 21, 2019 20:46
????? = vector.multiply(minetest.yaw_to_dir(yaw),speed)

### Re: Yaw and velocity Posted: Tue May 21, 2019 20:47
AiTechEye wrote:
Code: Select all
`lookat=function(self,pos2)   local pos1=self.object:get_pos()   local vec = {x=pos1.x-pos2.x, y=pos1.y-pos2.y, z=pos1.z-pos2.z}   local yaw = math.atan(vec.z/vec.x)-math.pi/2   if pos1.x >= pos2.x then yaw = yaw+math.pi end   self.object:set_yaw(yaw)endwalk=function(self,speed)   local yaw = self.object:get_yaw()   local speed = speed or 1   local x = math.sin(yaw) * -1   local z = math.cos(yaw) * 1   local y = self.object:get_velocity().y   self.object:set_velocity({      x = x*speed,      y = y,      z = z*speed   })   return selfendrun_away=function(self,pos)   lookat(self,pos)   self.object:get_yaw()   self.object:set_yaw(yaw+math.pi)   walk(self,2)end`

Wow, thanks!!! It works like a charm!!!

Just a little error:

local yaw = self.object:get_yaw()

### Re: Yaw and velocity Posted: Tue May 21, 2019 20:48
Termos wrote:????? = vector.multiply(minetest.yaw_to_dir(yaw),speed)

Thanks.

### Re: Yaw and velocity Posted: Wed May 22, 2019 17:25
To rotate it automatically into the movement direction: https://github.com/minetest/minetest/bl ... .txt#L5683

Smoothen it: https://github.com/minetest/minetest/bl ... .txt#L5687

Code: Select all
`-- entity definition .....automatic_face_movement_dir = 0,automatic_face_movement_max_rotation_per_sec = 100,`