dxDrawLine3D with rotation

[Overkillz]

Hello dear community, Im haivng an issue which is giving me some troubles. Im trying to project a line 3D between 2 points, the vehicle which is on the air and the ground.

Here is an example how it is drawn and how it is supposed to be drawn (WHITE line is how it is drawn and RED Line is how it should be drawn )

Spoiler

Sadly, I can't figure out how to use the proper maths here.

local x,y,z = getElementPosition(theVehicle)
local rx,ry,rz = getElementRotation(theVehicle)
local ground = getGroundPosition(x,y,z)
dxDrawLine3D(x,y,z,x+rx,y+ry,ground)

 

I hope you can bring me a hand with this problem

Thanks in advance, regards.

[Zango]

What are you trying to do with this? If you're looking to create a line that is always perpendicular to the vehicle then you can use getElementMatrix

local x1, y1, z1 = getElementPosition(theVehicle)
local m = getElementMatrix(theVehicle)
local x2 = -100 * m[3][1] + m[4][1]
local y2 = -100 * m[3][2] + m[4][2]
local z2 = -100 * m[3][3] + m[4][3]
dxDrawLine3D(x1, y1, z1, x2, y2, z2)

-100 is the length of the projected line, you can use processLineOfSight to find whatever it collides with.

[Overkillz]

@Zango

Thanks for your help. Yes, I had been looking for creating a line which was orthogonal to the vehicle.

However, Im so curious. I already see that with the Matrix you can get the rotation, offset ...etc of an element.

However, there are somo arrays that I cant figure out how to deal with them.

For what is used each array ? If you can clear me this question. 

Thanks for reading, regards.

[Zango]

You can search for better explanations on that than I can give you, read about what a translation matrix is and then a rotation matrix afterwards