Arithmetic, geometry, calculus, and all else which resolves the number-crunching necessary in a game. Math questions are those that deal with the formulae and calculations used by the game in various parts.
0
votes
1answer
37 views
Heightmap implementation in javascript question, a 2D water heightmap
I have a height map function from GPU Gems 2 Chapter 18, where they're generating a set of B/W pixels from this equation:
H(x,y,t) = Σi=0N h (
Axi x + Bxi,
Ayi y + Byi,
Ati x + ...
3
votes
1answer
90 views
Picking 3D with OpenGL ES 2
I'm trying to implement picking in my framework but I don't understand how I can do this.
I'm working with:
OpenGL ES 2.
GLM mathematic library.
What I have understand, picking can be made with ...
-1
votes
2answers
68 views
adding space between each bricks in breakOut [closed]
i am trying to create breakout. code below loop though my 2d array(map) and creates bricks. the problem is that i want to add 10 pixels space between each bricks. i was thinking to add ...
-5
votes
2answers
83 views
Should I negate a variable or use absolute value? [closed]
this is how i was chaning ball postion
if(...) //if ball goes to left of screen
dx = -dx
if(...) //if ball goes right of screen
dx = -dx;
i found some people using math.abs to move ball ...
0
votes
1answer
74 views
How to make healthbar size relative to hp
Like in most games with healthbars, the units in my game have a hp_bar object which is a frame, with a slightly smaller rectangle inside which should get smaller (and change color) as a unit loses hp, ...
1
vote
0answers
55 views
Reconstructing Position from Linear Depth
In gBuffer (RGBA32F) I store a linear depth (camera space z position). Next I draw a full screen quad (two triangles) and I want
to reconstruct the position.
Vertex shader:
#version 420
...
-1
votes
1answer
43 views
Need help with a complex 3d scene (using Ogre and bullet)
In my setup there is a box with a hole on one side, and a freely movable "stick" (or bar, tube). This stick can be inserted/moved through the hole into the box. This hole is exactly as wide as the ...
3
votes
2answers
108 views
What kind of projection is ScreenX=X/Z, ScreenY=Y/Z?
I have an existing class which transforms 3D vectors and projects them on a 2D plane (Camera). The code is all written in C without help from an external library.
To project a single vector (X,Y,Z) ...
2
votes
1answer
93 views
Negative scale in Matrix 4x4
After some rotations and to from quaternion conversions I get negative scale from Matrix 4x4, is it possible? I need that scale to draw sprite on screen so I get sprite flipped,
how to deal with this ...
0
votes
3answers
83 views
Keeping raycast on the same level
I want my raycast to end at certain height(red line). But as the game is 3D and the camera rotates I can't use a fixed magnitude. What I thought was a stroke of genius, I figured I'd project the ...
-3
votes
0answers
48 views
Bullet not return when player shoot to any object [closed]
package com.example.game4;
import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedList;
import javax.microedition.khronos.opengles.GL10;
import ...
8
votes
2answers
244 views
Drone targeting
Imagine a "drone" and a target point on a 2d plane. There are eight parameters:
P = my position
Q = target position
V = my velocity
I = my moment of inertia
w = my angular velocity
s = my angular ...
2
votes
1answer
83 views
Rotation independent rotation
I came up with some cube rotating, but I could not make it smooth and easy to use because as the cube turned - the keys that handle the turning changed their purpose. Link to demo. The demo rotation ...
4
votes
2answers
136 views
Getting an angle in degrees from north
This may have been asked already, but I was unable to find it, because I don't really know what I'm looking for. I drew a picture:
I need theta. I've seen various solutions using Vector.Dot, and ...
3
votes
1answer
124 views
What algorithm to use to fill a KenKen square board with cages?
I am working on recreating KenKen, a popular math puzzle involving a blank grid that is divided into "cages". Each cage is just a collection of adjacent squares and has a clue which is generally a ...
-1
votes
0answers
76 views
Career advice for design-oriented mathematician working in games [closed]
Lately, I've been looking for a career change. Over at Math StackExchange, I saw this answer discussing applications of mathematics to game development. Some of it had to do with graphics ...
0
votes
0answers
51 views
Going from point a to b through a curve using “gravity” [duplicate]
I have enemies and when they die they spawn an energy ball with a given velocity. I want to move this ball to the player using "gravity" to create a curved path. I have a version of the function but ...
4
votes
1answer
133 views
1D functions and shapes
I have a set of numbers I normalize ( so the converted number is between 0 and 1 ) which I want to pass trough a function, which in return gives me a different number between 0 and 1 based on the ...
-1
votes
0answers
63 views
Vector2 class design decisions
I'm designing my framework and i was wondering about what features would people appreciate to see in Vector2 class and also i wanted to ask you what design decisions would you like to see there.
...
-2
votes
0answers
134 views
dont understand 3d to 2d equation [solved] [closed]
solved:
the power at the end of the equation is because the difference in depth is exponential
for those who see it in the future learn about exponential function.
i learned it a week ago and ...
4
votes
3answers
153 views
Fast method of detecting whether point is inside mesh
I'm trying to construct a 3d object from a large number of particles. I think this is called BVH (Bounding volume hierarchy). I figured the best way is to draw the particles inside the mesh, then let ...
0
votes
0answers
62 views
Math concepts from the ground up; practical uses in game design? [duplicate]
I recently went back to school and chose to start learning math from the ground up, to ensure proper footing in higher level courses. I was always interested in game design and took a computer science ...
3
votes
2answers
106 views
Discover x,y coordinates given set arc distance and rotation
I have a turn-based car simulation. My vehicles have a maximum speed they can travel in a round, as well as a maximum amount they can change their heading over the course of a round. Say, 20 meters ...
2
votes
1answer
77 views
RGB to xyY color space conversion and luminance
The luminance calculated by following GLSL functions (fragment shaders - tonemap) has different value:
float GetLuminance (vec3 rgb)
{
return (0.2126 * rgb.x) + (0.7152 * rgb.y) + (0.0722 * ...
14
votes
1answer
274 views
How to simulate early politics? [duplicate]
I'm making a historically accurate game where the player can interact with past times and shape the future. The entire game is scientifically generated with math and real physics. (no, it won't have ...
3
votes
1answer
121 views
Quaternion Look At with Up vector
I have implemented a "look at" method for my screen elements and it almost works how I want it to work.
The ScreenElement class uses a R3 Vector and a Quaternion to determine the position and ...
0
votes
1answer
56 views
Different types of smooth object movement
In a game I have a specific object and two positions the object will move from and to.
I already have the function for calculating current position in specific time.
It works like this:
Inputting 0 ...
6
votes
4answers
191 views
Interstellar Economic Simulation
I'm designing a game reminiscent of Elite or Escape Velocity, those old space trading games, where you play a traveling merchant in space.
I'd like to have the game's economy at least resemble a real ...
8
votes
2answers
242 views
100 points between 0-1000 on an increasing scale
Basically, it's for roleplay, I need to generate 100 points along a scale. Level 1 is the starting amount, and is at point 0 on the scale. Level 100 is the highest amount planned at this point, and it ...
2
votes
3answers
113 views
Simulated Economic Factors Based on Supply and Demand in MMO Resource Trading Game
I'm working on a gam (naturally), and the primary activity for the player is to buy and sell commodities at various marketplaces.
Each commodity has the following properties:
Base Price: if all ...
1
vote
1answer
87 views
Canvas isometric translations to integer coordinates
I'm creating a canvas based game with an isometric playing board. I use the following transformations to get my square tiles to render on the screen:
'applyViewportTransformation' : function() {
...
4
votes
2answers
115 views
Inventory Grid Detection
I'm working on creating an inventory system for a game. The inventory system will use cells and 2D images to represent items, like Minecraft, Diablo, or WoW. I've hit a bit of a snag when trying to ...
-1
votes
3answers
102 views
Directional light and matrix issues
I'm trying to implement basic directional lightning in OpenGL 3.3 by emulating the logic shown in this guide: http://www.arcsynthesis.org/gltut/Illumination/Tutorial%2009.html
I do not understand ...
1
vote
1answer
60 views
A controlled trapezoid transformation with perspective projecton
I'm trying to implement a controlled trapezoid transformation in Adobe Flash's ActionScript using the built-in perspective projection facility. To give you an idea of how the effect looks like:
...
-4
votes
2answers
91 views
What effect does the amount of 0 in a stat have. [closed]
Basically I want to know if the following three characters are the same
character A
health 10
strength 3
defence 2
character B
health 100
strength 30
defence 20
character C
health 1000
...
0
votes
0answers
47 views
Uses for vector projection?
My previous question was solved by vector projection. Thus I spent some time studying it (Few helpful links: Interactive projection, short video and a longer video.).
There were plenty of sites that ...
3
votes
3answers
170 views
Getting correct angles between Vector3s
I'm working on a project where you can draw lines between points. You select one point and drag the mouse onto another point and a line is drawn between them.
The line itself is a 3d object which is ...
4
votes
1answer
169 views
deferred rendering and point light radius
I use a common attenuation equation for point lights:
attenuation = 1 / kc + kl * d + kq * d^2.
I use deferred rendering so I need to know a light radius. An example light has following intensity: ...
0
votes
2answers
125 views
games logic based on closed shapes
I would like to know the math concepts behind shape based games like http://www.miniclip.com/games/fat-slice/en/
To be specific, I would like to know on
how to model shapes programmatically
finding ...
0
votes
0answers
96 views
How to predict encounters between a ship and a body's sphere of influence in 2D
Long time listener, first time caller. I'm making a little hobby game in XNA, its about transport ships in space, analogous to container ships at sea. There are to be AI ships and player controlled ...
0
votes
1answer
194 views
How to extract euler angles from transformation matrix?
I have a simple realisation of entity/component game engine.
Transform component have methods to set local position, local rotation, global position and global rotation.
If transform is being set new ...
1
vote
2answers
99 views
Accumulating rotations for camera
It seems there are three ways to store a camera's rotation: in angles, view matrix or quaternion. I was using euler angles since when I used a matrix it had a tendency to accumulate rounding errors ...
0
votes
2answers
172 views
How to build a math module and simulate a system?
For example, in the classical game SimCity:
an economic model to simulate the supply and demand of the city, then calculate how many people live in each building, how many people work there.
a ...
0
votes
1answer
222 views
LibGDX Perspective Camera for 2D
I'm very new to LibGDX and I'm trying to use DecalBatch with PerspectiveCamera, simply to have z-coordinate for my sprites, as SpriteBatch does not offer that. However, I don't know how to calculate ...
3
votes
2answers
222 views
How to implement armor? [closed]
I am a newbie in Python, I am very bad at math too and I need some help. Also close/move this post if you feel this isn't the right place for it.
Hero1 = 5000 # His HP is 5k.
Hero1dmg = 200 # ...
0
votes
1answer
64 views
How to change Vectors due to change in it's dependent Base Vector?
PLOT :
I have been developing a game where the player falls down on Y axis and the camera is a Top-Down view camera. The camera, player (main character in the game) movements etc. have all been ...
4
votes
1answer
196 views
2D car physics and high speed turning
I've been looking at the following page, which has been very helpful: http://www.asawicki.info/Mirror/Car%20Physics%20for%20Games/Car%20Physics%20for%20Games.html but have come into problems with the ...
3
votes
1answer
60 views
Matrix Translation Transformation Question
I've been reading a lot about computer graphics lately and because of it I'm building my own math library's for fun. I was reading about Matrix Translation and Homogeneous Coords, and was wondering ...
4
votes
2answers
178 views
Defining an OpenGL unit
I have read that you can define your OpenGL unit by using glViewport.
As far as I understood if you use something like glViewport(0,0,600,600) then 1 OpenGL unit = 600 pixels. Now my problem is what ...
2
votes
2answers
167 views
Why does matrix multiplication lead to different result if it's done on CPU, compared to GPU(shader)?
If I'm calculating a "camera space" on the CPU, by multiplying the view with the projection matrix on the CPU , and afterwards multiplying the world to the result my vertices do not pass to the pixel ...
