What can I do with these asin, acos, atan, sin, cos, tan

You can write your topic however you want, but you need to answer these questions:

  1. What do you want to achieve? Keep it simple and clear!

Wants to use all their potentials

  1. What is the issue? Include screenshots / videos if possible!

I’m bad at math and I don’t understand everything.

  1. What solutions have you tried so far? Did you look for solutions on the Developer Hub?

I tried with Youtube, but its very hard.

A few exemples are enough, thanks.

4 Likes

Once you start to get into Algebra or Trigonometry classes, you’ll understand how these work; until then, I wouldn’t recommend you use them as you wouldn’t understand them. You might be able to find some Trigonometry tutorials online that help explain these, however.

3 Likes

Yes, i understand it a bit, but how to use sin, cos and tan?

But i dont understand the asin, acos and atan.

Like I said, once you get into higher level Maths classes, you’ll understand how these work. I’d recommend using Khan Academy; it’s a pretty decent source to learn Maths from, especially Trigonometry.

3 Likes

Those are trigonometric functions. The use cases are as plenty as there are use cases for addition and subtraction. You will most likely learn these functions in a trig or pre-calculus class.

Figure A:

Figure B:

Here I’m just going to talk about sine and cosine + their inverse functions asin and acos (math.sin and math.cos + math.asin and math.acos). It’s helpful to think about sine and cosine as the Y and X coordinates on a plane as Θ (theta) increases. In figure B, you can see the graph of y = sin(Θ) depicted by the red line and the graph of x = cos(Θ) in blue. It also shows you how that translates into coordinates on a plane. If you calculate x and y for every number between 0 and 2 * pi, it will result in a circle! You can graph the functions y=cos(x) and y=sin(x) from 0 to 2π on Desmos and convert the two values into X and Y coordinates if figure is confusing to you.

Tangent is the ratio between sine and cosine tan(Θ) = sin(Θ) / cos(Θ). Often times it can be represented as the “slope”; the “instantaneous tangent line” is something you learn how to calculate in a calculus class with limits and derivatives. Don’t worry too much about this one until you grasp the concept of sine and cosine first.

math.asin and math.acos do the opposite (inverse) of math.sin and math.cos. They return the Θ value that corresponds to the number from -1, 1 you pass in. I wouldn’t worry too much about those right now though. If you have any questions, feel free to ask them here.

23 Likes

If you’re really committed, Khan Academy has a free course on trig.

Learning things like this for ur Roblox projects is awesome when compared to learning things like this for a grade in school.

3 Likes

Thank you all, but I have to go to sleep net unfortunately, tomorrow I will ask all the questions I have in mind. Good night!

1 Like

Can you explain me this:

  local rDist = (camCF.p - surfaceCF.p):Dot(surfaceCF.LookVector)

The link I found this script in is this one

I was once just like you, not understanding any scripting or coding but after 4 years of algebra, i finally understood it. Now I’m a pro. Don’t worry, it does get easier with experience.

2 Likes

I use them most in springing and camera bobbing.

I would need to see the code in context. What is the code from? Can you send pictures?

1 Like

HERE, see Post 19

Thank you really for all your help, but one more question remains, is it really true that you would rather use the sine for the Y axis and the cosine for the X axis, if so, does that mean that the tangent is used for the Z axis? (P.S.: I saw it in this video, time 2:36)

2 Likes

It’s called the dot product, in vector calculus you use it to get the angle between two vectors.

5 Likes