The following function finds the normal to a terrain represented by a texture. I found it somewhere online , it works but i couldn't understand the math behind it. So , How (or Why ?) does it works ?
//psuedo code
Vector2 normal(x,y) {
Vector2 avg;
for(int w = -3; w <= 3; w++) {
for(int h = -3; h <= 3; h++)
[Code] ....
Okay I'm trying to calculate vertex normals for my terrain mesh. Obviously it's not working, but I can't work out why. Either its the way I calculate the normals, or the way I assign the final normal.
line 416 is where the normals are assigned to each point in my mesh. line 735 is the function for normals
class Normal3d {
private:
double x;
double y;
double z;
public:
Normal3d(double nx, double ny, double nz) : x(nx), y(ny), z(nz) {
}
Normal3d() {};
[Code]...
I've been in the process of making a simple ascii game and worked out to make random terrain that wasn't all that bad (but has some flaws and is not very efficient). I came across midpoint displacement and the diamond square algorithms and was blown away by the results that come from using them. So I decided to try implementing one into my game but I'm having a really hard time coding it out. I have read a whole bunch on them but haven't really found any good tutorials that breaks it down into steps with sample code. I just need it stored in an array I can handle graphics and output.
ex: 5x5 array with all starting corners being 9 in height
98679
87658
76557
88789
98889
^^Something simple like that.
I need to make a small program with a function with this prototype: void f(char *a,char *b) that adds two numbers represented as strings without using conversion operators or other tricks.
View 8 Replies View RelatedI have to create a class to represent a 2 dimensional vector. I need to include certain member functions such as a function to find magnitude of the vector, and one to find the dot product of that vector with another vector, and several others too. That's all fine. A stipulation of the problem is that I must include a constructor which can take cartesian form of the vector and a constructor which can take polar form of vector. Since this involves overloading the constructor the best solution I have come up with is to create the object with either doubles or floats so that the compiler can choose the correct constructor. This seems like a really bad idea. Is there a way I can get the compiler to choose the correct constructor without doing it using the precision? Here is a sample of my header file, there are many more member functions
class Vector{
public:
Vector(double x, double y, double v, double w){
myArray[0]=x;
myArray[1]=y;
additionalArray[0]=v;
additionalArray[1]=w;
[Code] .....
In my .cpp file the object is created with either four doubles or four floats depending on which constructor I want to implement. There must be a better way. Additional Array is created for use in member function which require calculations with a second 2d vector.
If I have a number 117, represented in binary as : 01110101 and I wanted to grab the top nibble. What would be the decimal value I would be extracting?
Would it be 0111 or 0101 decimal values 112 or 5 or is my understanding completely wrong?
I'm trying to load a PNG image to use as texture, but when I compile the sdl window closes. I'm sure the error is in the function of generating the png texture, because when i don´t use this function, the sdl window does not close. So debugging using cout i found that the cout above glTexImage2D function, shows in console, but the cout in below of glTexImage2D does not work. Does not reading this image?
hear is the function
#include "Texture.h"
#include <iostream>
Texture::Texture() {}
[Code].....
Im having problems with this little function im making
for some reason the texture dont get created (messagebox never gets called)
Im trying to pass a BYTE array of a image to the function
void AddTexture(BYTE* texture)
{
LPDIRECT3DTEXTURE9 Direct3DTexture = NULL;
if (D3D_OK == D3DXCreateTextureFromFileInMemory(pDevice, &texture, sizeof(texture), &Direct3DTexture))
{
MessageBoxA(NULL, "created", "created", MB_OK);
}
}
I am currently trying to apply a texture to a sphere I made, and have been following various tutorials. My program no longer crashes (used to be a problem but I figured it out), but the texture isn't being applied to the sphere. I used glut and SOIL to do this, but I am pretty sure that I am missing some necessary code from my own program for the textures to work. Because my program is a bit different from the tutorials though, I can't figure out what it is that I am missing. Below is what I have written to this point. It all compiles, and it successfully displays two objects (a sphere, and a pyramid), but neither object has textures, the pyramid simply has the colors it was set with (supposed to, I want to texture map the sphere first), while the sphere is a solid blue. What am I missing or what do I need to move?
#include <stdio.h>
#include <stdarg.h>
#include <math.h>
#include <stdlib.h>
#include <GL/glew.h>
#include <GL/glut.h>
[code]....
I'm trying to load a Quad with a Monster Image on it that will always face the Camera, a la Doom 2.
Now I don't know how to load an image with an Alpha part on it.
In 2D using SDL I always used tga files.
Here is my LoadTexture functions.
AUX_RGBImageRec *LoadBMP(char *Filename) // Loads A Bitmap Image
{
FILE *File=NULL; // File Handle
[Code].....
I'm trying to get a rotation of a spefic point in a 3D space using 3 or 4 coordinate/vector.
For example, I want to know the rotation of (5,5,5)
Using 4 vectors for example (0,0,0), (10,10,10), or 10,0,10, etc. (3 minimum)
I have been asked to develop a program with 6 methods which I have presented below. The aim of the program is to find and generate a magic square with a given dimension. This is a console program and so the 'Main' is also provided. However, I am having a problem with my code. When ever I try to generate a magic square it continuously cycles through 'forever' and I have never yet got a magic square; no matter what dimension I enter.
I must use methods 'CreateRandomlyAssignedArray' and 'CheckSquareMatrix'. There is another method 'SearchForValue', which we were told to creat. How this can be useful.
I have provided my code below:
class Program {
static Random rand = new Random();
static void Main(string[] args) {
int[,] array = new int[5,5];
array = GenerateMagicSquare(5);
[Code] ....
Write a function that generates 1000 normally distributed (Gaussian Probability Distribution) random numbers. Range should be between -3 and +3. Numbers should be double floating point.
There's more to it than that, but I've got it from there.
whats the difference between functions as pointer and normal function, eg:
void function1(void)
void *function1(void)
What is the difference between the two?I'm doing parallel programming and we use pointer functions (void *function1(void)) when calling threads. I want to why it is done.
So I have an object of class NRG (Normal Rand Generator) which takes, as an argument to it's constructor, an object of class RG (Rand generator).
template<typename RG>
class NRG {
RG rg;
public:
NRG(RG r):rg(r){}
double operator()();
An object of this class will return a normal random when it's member function operator()() is called:
template<typename RG>
double class NRG::operator()() {
static int flag = 0;
static double N2 = 0.0;
if(flag==0)
[Code] ....
However, when I run this I get an error which says:
C:UsersavadhootDesktopb.cpp|69|error: 'template<class RG> class NRG' used without template parameters|
C:UsersavadhootDesktopb.cpp|69|error: expected identifier before 'operator'|
C:UsersavadhootDesktopb.cpp|69|error: two or more data types in declaration of 'operator()'|
||=== Build failed: 3 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|
I am generating random number of normal distribution (0,1) but i suspect maybe I have done it wrong. The generator I use right now is
srand(time(0));
std::random_device rd;
std::mt19937 gen(rd());
std::default_random_engine generator;
std::normal_distribution<double> distribution(0,1);
Am I doing the right thing? Whether this is a real random number generator?
I need to convert this code into a normal function that can be put into a library.
Code:
#include <windows.h>
#include <stdio.h>
#include <tchar.h>
[Code].....
Like on line 21&22, I need to get the stuff from within the program, not through cmdline.
I have a fascination with Roman numerals and would like to create a C program that converts Roman numeral inputs to normal numbers.
I want to keep everything simple and only use the C library for the coding.
So i have to create a document where all the text is normal, but on the sides one word, a important word flashes...
how would i code that in c ?????????
oh yeah i am useing complier Bloodshed Dev C++ on windows 7
I want to generate random numbers of normal distribution and use scentence like
std::default_random_engine generator;
std::normal_distribution<double> distribution(0,1);
arrayX[i][j]=distribution(generator);
But I find that each time the array I got are the same. So how should I generate random numbers with different seedings with normal distribution?
I wrote the following program shown below that produces a normally distributed random number several times, and then takes the average of them. The problem that I have been having though is that the output it has been producing is 0.0288385 despite the fact that I set the mean of the normal distribution to be 0.1. Why this output value would be so far off from 0.1 despite having averaged over such a large number of random numbers namely 10,000 of them? Also, how to randomly seed this random number generator such that it gives a different value each time its run perhaps by seeding it with the windows timer? Below is the program.
#include <iostream>
#include <random>
using namespace std;
int main() {
default_random_engine generator;
normal_distribution<double> distribution1(0.1,3.0);
double number1,sum,n;
[code].....
I'm implementing an normal_distribution to select objects on a vector. The thing is I can't use values greater then 1 or less then -1. Here is what could be done:
gausx=gaus_distributionx(generator);
while((gausx>1) || (gausx<-1))
gausx=gaus_distributionx(generator);
The question is if the distribution would loose it's power to be a normal distribution, because some of the gerated numbers wouldn't be used. Any way to set ranges for the distribution?
I need creating a unique form of binary tree. I will eventually drop 256 balls into this to see the distribution, but its creating a pascals triangle recursively.
To create it I need to use two classes, a tree and a node class, and friend them create it recursively.
Program that reads in a normal text file and converts it into mobile phone text. that is if the word is 3 characters or less then ther is no changes to the word and if the word is four or more letters then remove all the vowels from the word except for vowels that are capitals.
View 5 Replies View RelatedI need to find S and how did you find S in N is 4
#include <iostream>
int main () {
int n,i,s;
cout<<"Put the number of n"<<endl;
cin>>n;
s=0
for (i=1;i<=n;i++)
s=s+i
cout<<"S is<<s<<endl;
return 0
}
I'm a beginner in C and system programming. I need to use multiple process and POSIX shared memory to find all primes between 0 and 100. My code compiles, but the result is not correct, it shows all the multiples of 3 as primes.My instructor also mentioned that the multi-process portion will fork() the appropriate number of child processes. The parent process will create a POSIX shared memory object to which the sub-processes will attach. I am confused about the things he said about parent process.why I'm not getting the right primes?
Code:
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/mman.h>
[Code]....