Questions tagged [mathematics]
Mathematics questions deal with the arithmetic, geometry, calculus, formulae and other calculations used in the development of a game.
1,826
questions
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Trigonometry to move an arm around axis in 3D space
Hello I have a question about rotating a Rod hinged to a fixed point (so it swings all around), and targets. short form, I would like to know how to find a rotation that would point my rod (while ...
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2answers
82 views
Formula for stacking percentages to keep them from getting out of control
I have a game that has a mechanic, where a specific class can stack what are called "life stealing enchantments" to steal greater amounts of health from the enemy depending on the type of ...
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0answers
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Could you explain how this GameObject rotating around another GameObject works?
I'm just learning Unity and I follow a tutorial for a simple game which I want to build up from.
I'm already mostly done with the course and at the end a "boss enemy" gets implemented.
Its ...
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1answer
60 views
Calculating child world translation, rotation and scale
I'd like to know if it's possible to calculate a child's world translation, rotation and scale individually. I'm used to seeing devs resorting to matrix multiplication and then decomposition, like so:
...
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1answer
32 views
How do I predict where a player will be next in Forge/MCP?
I am trying to predict where a player will be next based on where they are now in Java. I have their XYZ position, their XYZ motion, but I don't have their speed. How can I predict where they will be ...
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1answer
65 views
Java Simple 2D Grid Pathfinding
I want to code some basic pathfinding for my bot in Java. Below is a 2D grid representation of the 3D world. 0s being the places you can go, and 1s being the places that you cannot go.
...
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25 views
How to find player movement speed in Forge/MCP?
I want to predict where a player will be next based on where they are now. I have access to their XYZ, their motion in each direction, but I don't know how fast they are moving. Let's say that the ...
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1answer
37 views
How to interpolate smoothly between two yaw rotations less fast in MCP/Forge?
I am coding a custom client for Minecraft using MCP. (Please no hate, I'm not making a hacked client!) I have two variables currentYaw which is the current yaw ...
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1answer
24 views
How to find Particle Position at Time with velocity and friction?
I have a Particle p.
A particle consists of a start position p0,an age t, a velocity ...
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1answer
32 views
Arranging points in a 2D grid so that successively added points approximate a square shape
So, I ran into a problem with placing points in a grid while always trying to fit them into a square. Here are some examples (the numbers represent the order of placement):
Placing 1 point:
...
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0answers
19 views
Unity: how to make a kinematic rigidbody react to a rigidbody hitting it?
How do I make a non-kinematic rigidbody react to a "normal" rigidbody colliding with it in Unity? Like when the rigidbody hits the non-kinematic one, it pushes it back (note: not using the ...
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1answer
43 views
using a starting and ending point, how can i find how far in-between those two points a third point is?
quick diagram to explain what i mean. i have a start and an end, the third point can be anywhere in space, but i need to calculate from 0-1 how far they are in-between these two points.
The points are ...
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1answer
37 views
How to get the up direction given a point and rotation
TLDR:
I'm asking for the direction of the up vector of an entity that can rotate in JavaScript that has a x, y, and ...
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1answer
62 views
How to tile a texture
I'm creating a simple program in C# and now i'm trying to slice an image into multiple tiles similar to a grid pattern so it does not get stretched when drawing to different resolutions.
What i'm ...
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1answer
30 views
2d zooming function using transformation matrix
I'm trying to create a sort of "graphing calculator coordinate system" where you can zoom into a point by scrolling with the mouse wheel. I'm using javafx's transformation matrices (Affines) ...
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1answer
55 views
How to calculate speed of a moving object in unity
Currently I am trying to calculate the speed of an object here is the below code snippet:
...
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0answers
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How to find the center of mass from CapsuleCast in unity
Is there an easy way to find the center of mass from a CapsuleCast, or should I find the geometric center of it?
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0answers
79 views
How to implement texture slicing
I'm making a simple game in C# and i'm trying to slice my UI images into 9 smaller rectangles, so the image doesn't get stretched when drawing to different resolutions, but i'm having lots of problems ...
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0answers
13 views
Orthographic camera clip the model when Panned with mouse
I am dragging the camera (point Of View) of scene. I am using orthographic projection
Problem I am facing is suppose the camera is not rotated then I can drag the camera and it is working fine , But ...
3
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0answers
61 views
Approximate doom/heretic-style freelook distortion with modern graphics APIs
Currently working on a doom-like engine with fewer technical limitations, and looking into rendering techniques. I'm aware doom's a raycaster, and I want to capture a similar look but with modern ...
3
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2answers
214 views
How do you encourage players to do hard things?
I'm working on an app that teaches real-life skills by pitting players against each other to compete in skill improvement tasks. The problem is, players have a number of different tasks they're ...
1
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1answer
34 views
Pygame : problem with calculating an angle between two points
I've been struggling to calculate the angle alpha between an object and a certain point M so that I can move that object to M.
To calculate alpha, I'm using ...
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0answers
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implementation of a b-spline curve n points
hi i'm trying to implement the n points spline curve, but it seems like it requires some calculus knowledge.
Unfortunately I did not follow the calculation of high school.
I would like a function that ...
2
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2answers
95 views
How to orient a rectangular object, so when a sphere ( ball ) collision happens to redirect it towards a point?
I have a rectangular object and a ball ( sphere ) in 3D and would like to orient the rectangular object in such way that when a collision with the ball and the object happens, to redirect the ball ...
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1answer
53 views
Move two sprites together with offset?
I'm making a simple game in C# for practice and i'm having some problems when dragging a sprite
and making another sprite follow it.
What i'm trying to achieve:
When dragging a sprite, i want ...
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0answers
10 views
Move sprite in relation to parent? [duplicate]
I'm writing a simple game in C# and i'm having some difficulty to calculate the local position of a sprite.
What i'm aiming to achieve:
Calculate the sprite "local position" relative to the ...
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1answer
46 views
How to keep objects in the same position relative to their parent?
I'm writing a simple game in C# and i'm having some difficulty to calculate the local position of a sprite.
What i'm aiming to achieve:
Calculate the sprite "local position" relative to the ...
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0answers
15 views
Update the positions of child objects of a scroll bar when its parent moves?
I'm implementing a vertical scrollbar for a small game project and I'm having some issues with calculating
correct positions of the scrollbar controls when its parent control moves.
At the moment, ...
1
vote
1answer
53 views
How to draw splatter (one color) on 2D grid to cover approximate number of pixels? (looking for algorithm/math answers)
Imagine a 2D grid, where water stain increasing because of water drops. But not in plain circular way but more like noisy-splatter way. Or like corruption way. I want to create effect that will ...
2
votes
1answer
71 views
How to implement a simple Scrollbar
I'm making a simple UI system for a small game and i'm having some difficulty to implement a Scrollbar.
At the moment i'm having two major problems that i need some help to solve:
. Calculating the &...
1
vote
1answer
28 views
Space torque semi-independent of center of mass
I am making a 2d user build spaceship game that allows the user to place thrusters where they would like. I've read a bunch of posts in a lot of places including stack exchange on how determine the ...
0
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1answer
84 views
How can I create this springy oscillating motion chasing / orbiting the mouse?
I'm trying to recreate this motion,
I think most of the motion is based on this formula
\begin{eqnarray}
x(t) &=& A e^{-\gamma t/2} \cos(\omega t - \phi) \\
y(t) &=& B e^{-\gamma t/2} ...
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0answers
44 views
How do I replicate this camera effect?
I am trying to re-construct the camera logic of RE4 that is applied when the player aims a gun.
I have attached a hack to RE4 which enables the user to change the camera's FOV.
Because of that I ...
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3answers
125 views
Why is the derivative important in game development? How did you use it in a real scenario?
I'm really eager to know how a programmer finds useful a derivative in game development, using a real scenario as an example. Also I plan to use this question to understand the importance of ...
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1answer
17 views
Calculating view matrix from rotation, elevation and location
I have the rotation(A), elevation(B) and location(C) of a camera in a left handed 3d space. +...
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1answer
88 views
Best way to implement a to hit formula based on provided stats
There are a ton of these questions, some can get really mathy - which is fine, but I am looking for a simple way based on a few stats, I thought I came up with one, so I will share it in hopes that ...
1
vote
1answer
43 views
How to best deal with percentage from gear and skills when stacking
I have a issue I am unsure the best way to go about solving. Developing a game I store all the "percentage boosts" a character could get either from skills, equipment, quest items or whatnot ...
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0answers
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Why does the clip length of an animation not match my math?
I need to re-create an existing animation. The new animation should have the same amount of frames and length and FPS.
Unity shows the following for the original / existing animation:
As one can see, ...
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0answers
32 views
how can I normalize the speed of a polygon moving over a series of connected quadratic bezier curves with varying lengths?
I am generating a bunch of quadratic curves that are connected together, creating an array of curves, and a function which returns the position on the curve for a given time.
...
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0answers
20 views
How can I draw a partial circle with LineRenderer?
I'm using the following code, which I found online, to draw a circle with a predefined radius centred on a predefined point in LineRenderer (2D game).
...
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0answers
58 views
How to design a system that allows for custom equations of movement?
I'm developing a top-down shooter and I currently have a PhysicsSystem which operates on TransformComponents. Basically, it ...
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1answer
62 views
Matrix math in cascade shadow mapping
I am implementing cascade shadow mapping algorithm and currently stuck with matrix transformations - my AABBs, when projected in light space are pointing in the direction opposite to the light:
I was ...
2
votes
1answer
167 views
Drawing OpenGL camera frustum
I am trying to display camera frustum in my OpenGL application. I calculate the vertices of the frustum pyramid using reverse projection from screen space to world space. The camera uses perspective ...
0
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1answer
62 views
What happens if first we scale a rotation matrix and then multiply it with an object?
This question has been bothering me lately. I know the correct order to scale, rotate and transform a matrix but the question I have is very different. What if we first scale our rotation matrix by ...
4
votes
2answers
100 views
Can't figure out math for converting negative indices of my voxels and chunks to positives
In my voxel game, I'm trying to spawn chunks in all directions. But since my world starts at 0,0,0, some chunks can spawn at negative positions like ...
0
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1answer
62 views
RNG random numbers/preset payout rate contradiction
Taking a casino slot machine for example: How can the probability of a payout TRULY be random with a preset payout rate?
If a casino has slots programmed to a specific rate or percentage of payout, ...
0
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1answer
19 views
Euler Angles of Any Great Circle from hit.point of a sphere
How do you get the Euler Angles of Euler Angles of Any Great Circle that surrounds the raycast hit.point of a sphere?
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1answer
23 views
Ray-Triangle Intersection: does the direction of the triangle normal matter?
Found an article here about ray triangle intersection: https://www.scratchapixel.com/lessons/3d-basic-rendering/ray-tracing-rendering-a-triangle/ray-triangle-intersection-geometric-solution
It states ...
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1answer
42 views
Movement within a circle, but the circle bends around obstacles?
I wish I knew a better way to phrase this, but I want to make an object move from point to point inside a circle. But I also want that "circle" to bend around obstacles, so that no matter ...
0
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1answer
40 views
How to construct a matrix with the following mapping
How would I create a matrix that maps coordinates like so:
Near plane
x: [-3,3] -> [-1,1]
y: [-6,2] -> [-1,1]
z: 2 -> -1
Far plane
...
