[HELP] Element Rotation

[MrCode]

Good evening, Community!

I need some help calculating an element's rotation based on the following matrix calculation:

'Point_B' is basically the point of which our player or vehicle element is facing towards, we draw a green "+" to show point_B's position on screen. Using processLineOfSight, we are able to show exactly where we're pointing to in the 3D world.

The problem is, or what I would really like achieve in this example snippet is, rotating our test object (AK-47) so that it is pointing directly at "Point_B". 

 

-- client.lua
-- OOP true

setElementPosition( localPlayer, -281.52420, 1539.13477, 75.35938 ) 				-- Test location
local theObject = createObject( 355, -281.52420, 1539.13477, 75.35938, 0, 0, 0 ) 		-- Test object (AK-47)

addEventHandler( "onClientRender", root, function ( )
	
	-- CALCULATE "POINT_A" / "POINT_B"
	----------------------------------------
	local matrix = localPlayer:getMatrix( 0, 0, 0 )
	local point_A = matrix:transformPosition( 0, 0, 0 )
	local point_B = matrix:transformPosition( 0, 500, 0 )
	local hit, x, y, z, element = processLineOfSight( point_A, point_B, true, true, true, false, false, false, false, true, localPlayer )
	local hit_start = Vector3( x, y, z )
	local point_B = hit and hit_start or point_B
	local scr = Vector2( getScreenFromWorldPosition( point_B ) )
	----------------------------------------


    	-- CALCULATE OBJECT ROTATION:
    	-- Point at which I've lost my brain-cells
	-----------------------------------
	local rotX, rotY, rotZ = math.random( 0, 360 ), math.random( 0, 360 ), math.random( 0, 360 ) -- current position of the final brain cell
	setElementRotation( theObject, rotX, rotY, rotZ ) -- rotate Test object (AK-47) to point to: "Point_B"
	----------------------------------------


	-- DRAW GREEN TARGET POINT AT: "Point_B"
	----------------------------------------
	if ( scr.length > 0 ) then
		dxDrawText( "+", scr - Vector2 ( 0, 0 ), 0, 0, tocolor ( 0, 255, 0, 255 ), 2, "default" )
	end
end )

 

Edited February 16 by MrCode

[IIYAMA]

3 hours ago, MrCode said:

The problem is, or what I would really like achieve in this example snippet is, rotating our test object (AK-47) so that it is pointing directly at "Point_B". 

See:

https://wiki.multitheftauto.com/wiki/FindRotation3D

[MrCode]

13 hours ago, IIYAMA said:

See:

https://wiki.multitheftauto.com/wiki/FindRotation3D

Thanks IIYAMA, FindRotation3D worked for the getting rotation. 

Did not achieve the desired result with a rocket projectile (19) though. Even after rotating it directly at point_B the projectile eventually starts heading out in a different direction, not exactly sure whats up with that. I think an easy way to fix that is using createObject along with moveObject and stuff, but in this case, what should I use to properly send projectiles from point A to point B since createProjectile only has starting position arguments to work with?

[IIYAMA]

7 hours ago, MrCode said:

Thanks IIYAMA, FindRotation3D worked for the getting rotation. 

Did not achieve the desired result with a rocket projectile (19) though. Even after rotating it directly at point_B the projectile eventually starts heading out in a different direction, not exactly sure whats up with that. I think an easy way to fix that is using createObject along with moveObject and stuff, but in this case, what should I use to properly send projectiles from point A to point B since createProjectile only has starting position arguments to work with?

Are you using this function?

https://wiki.multitheftauto.com/wiki/CreateProjectile
 

Attach a dummy vehicle to the object and set the vehicle as the creator of the projectile.

Because else your camera is used for the direction.