Develop Reference

How to create a sphere-shaped tile terrain using a for?

I initially apologize for my English, because I am from Brazil.
So I am creating a tile-generating terrain, but in this code below I create a square terrain, I would like to spheronize my terrain.
I would like to do something close to this.
https://i.stack.imgur.com/kxzUc.jpg
List<Vector3> map = new List<Vector3>();
public List<Vector3> GenerateMap(int width, int height)
{
for (int x = 0; x < width; x++)
{
for (int z = 0; z < height; z++)
{
SpawnTile(new Vector3(x, 0, z ));
}
}
return map;
}
I would like to do something close to this.

Generating Lookup Table For 3D Noise

I'm having trouble understanding why my lookup table is not working. I currently have one that generates a table for 2D noise, which works fine.
int xOffset = chunk.Pos.x;
int zOffset = chunk.Pos.z;
// Generate a lookup table
int i = 0;
for (int z = 0; z<ni.noiseGen.Size; z++)
{
float zf = (z<<ni.noiseGen.Step)+zOffset;
for (int x = 0; x<ni.noiseGen.Size; x++)
{
float xf = (x<<ni.noiseGen.Step)+xOffset;
ni.lookupTable[i++] = NoiseUtils.GetNoise(noise.Noise, xf, 0f, zf, 75f, 100, noise.Gain);
}
}
When I try to iterate over a y axis, it does not work. An index out of range exception is thrown. Below is the attempted 3D lookup table.
int xOffset = chunk.Pos.x;
int yOffset = chunk.Pos.y;
int zOffset = chunk.Pos.z;
// Generate a lookup table
int i = 0;
for (int z = 0; z<ni.noiseGen.Size; z++)
{
float zf = (z<<ni.noiseGen.Step)+zOffset;
for (int y = 0; y<ni.noiseGen.Size; y++)
{
float yf = (y<<ni.noiseGen.Step)+yOffset;
for (int x = 0; x<ni.noiseGen.Size; x++)
{
float xf = (x<<ni.noiseGen.Step)+xOffset;
ni.lookupTable[i++] = NoiseUtils.GetNoise(noise.Noise, xf, yf, zf, 75f, 100, noise.Gain);
}
}
}
I'd assume it'd be as easy as that, but I was wrong and do not understand why. Any enlightenment would be appreciated, thanks!

Ah, after looking over how ni.lookupTable was declared I realized I forgot to multiply by the size one more time for 3D. It is now declared like this,
ni.lookupTable = pools.FloatArrayPool.Pop(ni.noiseGen.Size*ni.noiseGen.Size*ni.noiseGen.Size);
My apologies!

how to limit CreateCell c# procedural grid generation unity

I am learning C# for unity and could use some pointers.
I am following catlikecoding hex map tutorial but I have modified the grid for my own means.
http://catlikecoding.com/unity/tutorials/hex-map-1/
My goal is to create a pyramid of squares procedurally starting from a 7 * 7 grid. I am using a prefab plane
How do I place a limit on The CreateCell looped function so that cells with the (x,y) coordinates are not created when they meet the following expression
x + y > n - 1 where n = grid size (for example (6,1) or (5,6)
I have gotten as far as creating a rhombus of planes with the undesired planes below the ground plane.
The script is as follows.
public class HexGrid : MonoBehaviour {
public int width = 7;
public int height = 7;
public int length = 1;
public SquareCell cellPrefab;
public Text cellLabelPrefab;
SquareCell[] cells;
Canvas gridCanvas;
void Awake () {
gridCanvas = GetComponentInChildren<Canvas>();
cells = new SquareCell[height * width * length];
for (int z = 0 ; z < height; z++) {
for (int x = 0; x < width; x++) {
for (int y = 0; y < length; y++)
CreateCell(x, z, y);
}
}
}
void CreateCell(int x, int z, int y) {
Vector3 position;
position.x = x * 10f ;
position.y = ((y + 1) - (x + z)) * 10f + 60f;
position.z = z * 10f ;
Cell cell = Instantiate<Cell>(cellPrefab);
cell.transform.SetParent(transform, false);
cell.transform.localPosition = position;
Text label = Instantiate<Text>(cellLabelPrefab);
label.rectTransform.SetParent(gridCanvas.transform, false);
label.rectTransform.anchoredPosition =
new Vector2(position.x, position.z);
label.text = x.ToString() + "\n" + z.ToString();
}
}
Grid so far

A quick solution would be to add an if statement before the part of the code that creates a cell. In this case the method CreateCell(). That if statement should have your logic in code. You would also have to create two variables for the size to check. For example:
public int tempX;
public int tempY;
void Awake () {
gridCanvas = GetComponentInChildren<Canvas>();
cells = new SquareCell[height * width * length];
for (int z = 0 ; z < height; z++) {
for (int x = 0; x < width; x++) {
for (int y = 0; y < length; y++)
{
if (x + y < (tempX + tempY) - 1)
{
CreateCell(x, z, y);
}
}
}
}
}

How would I subdivide an arbitrary cube into smaller cubes?

I'm trying to write an algorithm that will split an arbitrary quad into smaller quads that all have the same x, y, and z scales (so, cubes). Right now I have code that splits quads into scaled down versions of themselves, but I'd like the ratio to be 1:1:1. How would I modify the code below to do that?
for (int x=0; x < 2; x++) {
for (int y=0; y < 2; y++) {
for (int z=0; z < 2; z++) {
GameObject newCube = Instantiate(gameObject);
newCube.transform.localScale = new Vector3(
newCube.transform.localScale.x/2,
newCube.transform.localScale.y/2,
newCube.transform.localScale.z/2
);
newCube.transform.position = new Vector3(
newCube.transform.position.x + ((x-0.5f) * newCube.transform.localScale.x),
newCube.transform.position.y + ((y-0.5f) * newCube.transform.localScale.y),
newCube.transform.position.z + ((z-0.5f) * newCube.transform.localScale.z)
);
}
}
Destroy(gameObject);

If I understood you correctly, you want to make squares from a rectangle (actually the 3D equivalent of those, but whatever).
So your inner squares must have a side, at most, half of the SMALLER side of the rectangle. And, since they are squares, all the sides must have the same size. So, you must find which is the smaller side of x, y and z, and create your cubes with all sides set to half of that value.
Putting that into your code:
for (int x=0; x < 2; x++) {
for (int y=0; y < 2; y++) {
for (int z=0; z < 2; z++) {
GameObject newCube = Instantiate(gameObject);
var cubeSize = Math.Min(oldQuad.x, Math.Min(oldQuad.y, oldQuad.z)) / 2;
newCube.transform.localScale = new Vector3(
cubeSize,
cubeSize,
cubeSize
);
newCube.transform.position = new Vector3(
newCube.transform.position.x + ((x-0.5f) * newCube.transform.localScale.x),
newCube.transform.position.y + ((y-0.5f) * newCube.transform.localScale.y),
newCube.transform.position.z + ((z-0.5f) * newCube.transform.localScale.z)
);
}
}
Destroy(gameObject);
Since you told nothing about how you want to position them, I keep that part the same.

What's wrong with this 2D array initializing code?

I am trying to take the positions of the cells of a game level and map them to a 2D array. I want to do this so I can make each ground cell (and NOT background cell) collidable with my player character.
Below is the current code that someone created for me:
int tileSize = 20;
int screenSizeInTiles = 30;
// initializing multidimensional array of points
var tilePositions = new System.Drawing.Point[screenSizeInTiles, screenSizeInTiles];
for (int x = 0; x < screenSizeInTiles; x++)
{
for (int y = 0; y < screenSizeInTiles; y++)
{
tilePositions[x, y] = new System.Drawing.Point(x * tileSize, y * tileSize);
}
}
It can be found here: How can I use a jagged array to record the x and y axes of these tiles?
along with a better description of what I'm trying to do.
So, when I run this code, I get an empty array in tilePositions. Well, the x, and y values are there, but the values are all 0. The values should be the position data for the cells.
Here is what the tilesPosition array looks like:
http://imgur.com/VYyxp
I'm still working on the collision code though... I need this to work before I can figure that part out.
Thank you all incredibly much, you have been so helpful! I am still a beginner, but am working around the clock to make myself a better programmer.

if you did
int tileSize = 20;
int screenSizeInTiles = 30;
// initializing jagged array of points
var tilePositions = new Point[screenSizeInTiles][screenSizeInTiles];
for (int x = 0; x < screenSizeInTiles; x++)
{
for (int y = 0; y < screenSizeInTiles; y++)
{
tilePositions[x][y] = new Point(x * tileSize, y * tileSize);
}
}
it would be jagged (an array of arrays.)