[Chdata]

I have so many uses for this and yet no idea how to do the math for this.

PHP Code:

stock TranslatePoint(Float:vPos[3], const Float:vAng[3], const Float:flDist) {
    vPos[0] += 0.0;
    vPos[1] += 0.0;
    Vpos[2] += 0.0;
} 


The math is simple in a cartesian plane... but I have no idea in 3D space.

Similarly, I'd like to know how to get the angle from point 1 ---> point 2

For example, let's say I want to make a rocket launcher that shoots 4 rockets. Each rocket should still move towards your cursor and I want to spawn one from the 4 corners of a player's screen, so each rocket appears to fly inward to the same target.

Essentially I'd use TranslatePoint with the player's eye position and eye angles to some arbitrary point flDist away to get the position in the distance that the "cursor" is at.

From the player's eye position, I'd TranslatePoint 4 more times in 4 different angles to make rockets spawn in the four corners of my screen, and I'd set the angle of those rockets from one of the 4 points to the cursor's point in the distance.


However bad that example is, I have plenty of other things this'd be useful for... if anyone can help.

I am not looking for tracerays. I don't necessarily have to care about world collision.

[Powerlord]

Disclaimer: 3D math isn't my strong suit.

Just an FYI.

On a Cartesian plane, you're only dealing with a single angle in the x-y dimensions.

On a 3D plane, you're dealing with 3 angles:

• Pitch - y-z (up-down) angle
• Yaw - x-y (let-right) angle
• Roll - x-z ("spin") angle

And one last thought here: The player's FOV is going to change where the corners of their screen are.

[Miu]

PHP Code:

AnglesToUV(Float:vOut[3], const Float:vAngles[3])
{
    vOut[0] = Cosine(vAngles[1] * FLOAT_PI / 180.0) * Cosine(vAngles[0] * FLOAT_PI / 180.0);
    vOut[1] = Sine(vAngles[1] * FLOAT_PI / 180.0) * Cosine(vAngles[0] * FLOAT_PI / 180.0);
    vOut[2] = -Sine(vAngles[0] * FLOAT_PI / 180.0);
} 


Once you have the unit vector, a point x units from point p in direction d is p + x * d

Originally Posted by Chdata Similarly, I'd like to know how to get the angle from point 1 ---> point 2

Subtract point 1 from point 2 and normalize it, and you'll have a unit vector in that direction.

[Chdata]

Yes that's just an example, I just didn't know how else to word "spawn 4 rockets diagonally in NE/SE/NW/NW angles originating from the center of one's view such that they all aim at the same point and appear like a shrinking X shape". See how confusing that is?

[Chdata]

Originally Posted by Miu PHP Code: AnglesToUV(Float:vOut[3], const Float:vAngles[3]) {     vOut[0] = Cosine(vAngles[1] * FLOAT_PI / 180.0) * Cosine(vAngles[0] * FLOAT_PI / 180.0);     vOut[1] = Sine(vAngles[1] * FLOAT_PI / 180.0) * Cosine(vAngles[0] * FLOAT_PI / 180.0);     vOut[2] = -Sine(vAngles[0] * FLOAT_PI / 180.0); }  Once you have the unit vector, a point x units from point p in direction d is p + x * d Subtract point 1 from point 2 and normalize it, and you'll have a unit vector in that direction.

Thanks, this seems to have solved it ;O

[thecount]

3 dimensional is just 2 dimensional with lots more triangles.