Questions tagged [floating-point]
Floating point numbers are approximations of real numbers that use a form of scientific notation to store significant figures and an exponent. Use this tag for questions that pertain to the use of floating point numbers in games.
61 questions
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How can I improve vector collision algorithm?
I'm making a game (shocker) in pygame and had issues with tile-based collision detection. There are 5 different non-empty tile types (pictured below) which can be rotated in increments of 90 degrees ...
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Is there a logical reason for SFML's Vector2 being templated?
The game development library SFML has a Vector2 class template (and a Vector3 for that matter), which can use any arithmetic ...
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How can I make a reliable time-based object updating system?
So an object has a position, velocity, and is affected by gravity.
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24bit float to RGB
There's solutions to convert float to RGBA but I would like to encode a float depth value in RGB format and save the three components in three separated unused alpha channels and recompose when needed....
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Convert integer to float while also dividing down the scale, without data loss
I'm working on a game, and my intent is to avoid use of floating point for unit positions. To that end, I'm using 32-bit integers for all positions, with a millimeter scale.
However, for rendering, I ...
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How to deal with players having too much money (or any large numbers)?
I'm working on a browser MMORPG in PHP and MySQL and today got a bug report about int32 overflow, due to the player having too much money. When I was designing the core system, I completely forgot ...
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How can I perform a deterministic physics simulation?
I'm creating a physics game involving rigid bodies in which players move pieces and parts to solve a puzzle/map. A hugely important aspect of the game is that when players start a simulation, it runs ...
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How much slower is it to draw on "half pixels"?
I've noticed that games like Diep.io are using floating decimal points for thin stroke lines on the grid. I have even tried this myself, by adding 0.5 to all of the ...
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Why loss of floating point precision makes rendered objects vibrate?
I'm working on an open-world game. I noticed glitches when I move far away from the origin. The objects seem to be shaking or wiggle. Especially the z-fighting seems to wiggle. And the objects that ...
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Prevent tile layout gaps
I'm making a map viewer where you can specify where tiles go in a map and then see it on the screen, translate it, and zoom in and out.
Here's a picture showing the tiles used to make my example map
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How can I render geometry represented in a 64-bit floating point environment?
In this video about Star Citizen, right at the 12:30 mark on the timeline you can see the player zooming in on a space station who's location is clearly out of the limit of 32-bit floating point ...
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Float inaccuracy. libgdx only? java only? also why?
Hey all I have just come to notice that floats are not accurate even when they are explicitly set and unchanged. For example i have some basic code running and it is:
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Non-integer speed values - is there a cleaner way to do this?
Often I will want to use a speed value such as 2.5 for moving my character in a pixel-based game. Collision detection will generally be more difficult if I do that, though. So I end up doing something ...
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Unity, positioning with ints instead of floats
I round my transform.position to the nearest integer at the end of every frame so it's never a decimal number. I would like to know if there's a way to make unity store the position in ints instead of ...
user61929
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In Unreal, what are the differences between C++'s float and FFloat32?
I have been trying to learn some deeper aspects of UE4 and while reading many examples codes and also the source base of the engine, I noticed that sometimes people (and the very source code) use the ...
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Handle floating point precision errors in collision detection and resolution
I am experimenting with a continuous collision detection and response of points on a tile map.
This are my results for now:
I did this by shooting a ray (red line) from the current position (red ...
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How do I avoid floating point indeterminism when implementing lockstep?
I am working on a multiplayer RTS game in Java. It uses lockstep for networking, which requires that both computers can deterministically.
These are the 2 closest/more viable approaches I could come ...
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WebGL half float equivelant?
I'm trying to find a half float for the purposes of doing math in a fragment shader, not trying to have a half float texture.
Is there an equivalent of the ...
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Getting around limitations posed by float in space game
I'm working on a procedurally generated game set in outer space. As in the real world, the game universe will be pretty much 99% empty, with planets/stars/solar systems etc... being very far apart.
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How do I generalise Bresenham's line algorithm to floating-point endpoints?
I'm trying to combine two things. I'm writing a game and I need to determine the grid squares lying on a line with the floating-point endpoints.
Moreover I need it to include all the grid squares it ...
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How can I simplify this code to compute the shortest rotation between two angles?
The following code will find the shortest rotation (in radians) (from pi to -pi) that I need to apply to from to leave me with to...
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How to reset the world in an infinite runner game to prevent an overflowing float?
Im following Mike Geig's 2D infinite runner tutorial. However, I'm seeing a potential problem of overflowing the float
How can I reset all objects and camera back again to the origin?
The approach I'...
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Deterministic calculation in JavaScript [closed]
I want to create a multiplayer game with HTML/JavaScript and only send user input between players. I read some articles for C++, saying that I could not expect floating point to get the same results ...
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XNA Float values don't work as parameter
With the Microsoft XNA Framework I can change the color of a tinted texture by changing it's integer values like so:
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Issues calculating frame independent movement
I'm developing a Breakout style game in C++ using SDL. The problem so far is that the ball slows down and speeds up for no particular reason.
The slowdowns usually last a few seconds.
EDIT : When ...
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