[Math] Direction to Rotation?

[stillhere]

Hello, I'm no good at math so I'm asking here:

How would you modify this RotationToDirection code to instead calculate DirectionToRotation?

Thanks in advance! This is probably trivial for some of you haha

Edit: I gave it a try in my next post! I still need help though.

Edit: seems to be solved now

Edited December 7, 2016 by stillhere

[Jitnaught]

Might be able to convert this code to C#/Script Hook V .NET.

[stillhere]

Might be able to convert this code to C#/Script Hook V .NET.

Thanks, though that would be harder than trying to work it out with the C# RotToDir code I think! So I gave it a try and it works well, except for one thing: the function will always return rotation.Z as a positive number, even when the actual rotation should be negative. Here's the code I've been working on:

Vector3 DirToRot(Vector3 Dir)        {            try            {                /*                This is rotation to direction:                rotx = 0.2                retx = 0.2 *  0.0174532924 = 0.00349065848 //radians to degrees                Cos(0.2 *  0.0174532924) = 0.9999939076578741                absx = Abs(Cos(0.2 *  0.0174532924)) = 0.9999939076578741                rotz = 0.3                retz = 0.3 * 0.0174532924 = 0.00523598772 //radians to degrees                dirx = -Sin(retz) * absx =  -0.005235963795437085 * 0.9999939076578741 = -0.0052359318961542843713968514009985 //-0.0052359318961542846 if rounded                diry = Cos(retz) * absx = 0.9999862922476151 * 0.9999939076578741 = 0.999980199989                dirz = Sin(retx) = 0.0052359637954370846088922220789420743196847079456760                now this is direction to rotation:                dirz = Sin(retx) =  0.0052359637954370846088922220789420743196847079456760                num1 = retx = Asin(dirz)                rotx = num1 / 0.0174532924                num2 = absx = Abs(Cos(num1)                num3 = diry / num2 = Cos(retz)                num4 = retz = Acos(num3)                rotz = num4 / 0.0174532924                roty?                */                float dirz = Dir.Z;                float num1 = (float)Math.Asin(dirz);                float rotx = num1 / 0.0174532924f;                float diry = Dir.Y;                float num2 = (float)Math.Cos(num1);                float num3 = diry / num2;                float num4 = (float)Math.Acos(num3);                float rotz = num4 / 0.0174532924f;                return new Vector3(rotx, 0, rotz);            }            catch            {                return Vector3.Zero;            }        }

I test it with this:

UI.ShowSubtitle(Game.Player.Character.Rotation.ToString() + "---" + DirToRot(Game.Player.Character.ForwardVector).ToString());

Anyone know how to get the proper sign for the Z rotation?

Edit: if I do it this way, the sign changes accordingly, but once the players rotation goes above 90 or below -90, the DirToRot function starts going the opposite way

ex: if player's rotation.Z is -180, DirToRot.Z will be 0

if player's rotation.Z is 135, DirToRot.Z will be 45

if player's rotation.Z is -135, DirToRot.Z will be -45

any ideas?

Vector3 DirToRot(Vector3 Dir)        {            try            {                float dirz = Dir.Z;                float num1 = (float)Math.Asin(dirz);                float rotx = num1 / 0.0174532924f;                                float dirx = Dir.X;                float num2 = (float)Math.Cos(num1);                float num3 = dirx / num2;                float num4 = (float)Math.Asin(-num3);                float rotz = num4 / 0.0174532924f;                return new Vector3(rotx, 0, rotz);            }            catch            {                return Vector3.Zero;            }        }

Edited December 6, 2016 by stillhere

[CamxxCore]

Maybe this is helpful? https://tohjo.eu/dapkcuf/citizenmp/blob/c8710f0a3cf076c7f2a8fcbb22ed2902116f4f4c/client/clrcore/Math/GameMath.cs

[stillhere]

Maybe this is helpful? https://tohjo.eu/dapkcuf/citizenmp/blob/c8710f0a3cf076c7f2a8fcbb22ed2902116f4f4c/client/clrcore/Math/GameMath.cs

That looks good.. but I've edited my code a bit and it seems to work well now

        Vector3 DirToRot(Vector3 Dir)        {            try            {                /*                This is rotation to direction:                rotx = 0.2                retx = 0.2 *  0.0174532924 = 0.00349065848 //radians to degrees                Cos(0.2 *  0.0174532924) = 0.9999939076578741                absx = Abs(Cos(0.2 *  0.0174532924)) = 0.9999939076578741                rotz = 0.3                retz = 0.3 * 0.0174532924 = 0.00523598772 //radians to degrees                dirx = -Sin(retz) * absx =  -0.005235963795437085 * 0.9999939076578741 = -0.0052359318961542843713968514009985 //-0.0052359318961542846 if rounded                diry = Cos(retz) * absx = 0.9999862922476151 * 0.9999939076578741 = 0.999980199989                dirz = Sin(retx) = 0.0052359637954370846088922220789420743196847079456760                now this is direction to rotation:                dirz = Sin(retx) =  0.0052359637954370846088922220789420743196847079456760                num1 = retx = Asin(dirz)                rotx = num1 / 0.0174532924                num2 = absx = Abs(Cos(num1)                num3 = diry / num2 = Cos(retz)                num4 = retz = Acos(num3)                rotz = num4 / 0.0174532924                roty?                */                float dirz = Dir.Z;                float num1 = (float)Math.Asin(dirz);                float rotx = num1 / 0.0174532924f;                                float dirx = Dir.X;                float num2 = (float)Math.Cos(num1);                float num3 = dirx / num2;                float num4 = (float)Math.Asin(-num3);                float rotz1 = num4 / 0.0174532924f;                float diry = Dir.Y;                float num5 = (float)Math.Cos(num1);                float num6 = diry / num5;                float num7 = (float)Math.Acos(num6);                float rotz2 = num7 / 0.0174532924f;                                if (rotz1 > 0)                {                    if (rotz2 < 90)                    {                        trueRotZ = rotz1; //trueRotZ is a global float variable.                    }                    else                    {                        trueRotZ = rotz2;                    }                }                else                {                    if (rotz2 < 90)                    {                        trueRotZ = rotz1;                    }                    else                    {                        trueRotZ = -rotz2;                    }                }                return new Vector3(rotx, 0, trueRotZ);            }            catch            {                return Vector3.Zero;            }        }