// Mesh generation. It's never fun
private void GenerateMesh()
{
// x/y/z
int index = 0;
for (int y = 0; y < worldSize.y; y++)
{
for (int x = 0; x < chunkSize; x++)
{
for (int z = 0; z < chunkSize; z++)
{
Vector3Int localPosition = new Vector3Int(x, y, z);
Vector3Int worldPosition = chunkWorldPosition + localPosition;
if (!terrain.IsPresent(worldPosition))
{
continue;
}
TerrainType tileType = terrain.GetType(worldPosition);
TerrainTypeMaterialInfo materialInfo = materials[(int)tileType];
if (!terrain.IsPresent(new Vector3Int(worldPosition.x, worldPosition.y + 1, worldPosition.z)))
{
index += GenerateTopWall(index, worldPosition, localPosition, materialInfo);
}
if (!terrain.IsPresent(new Vector3Int(worldPosition.x, worldPosition.y - 1, worldPosition.z)))
{
index += GenerateBottomWall(index, worldPosition, localPosition, materialInfo);
}
if (!terrain.IsPresent(new Vector3Int(worldPosition.x, worldPosition.y, worldPosition.z - 1)))
{
index += GenerateSouthWall(index, worldPosition, localPosition, materialInfo);
}
if (!terrain.IsPresent(new Vector3Int(worldPosition.x, worldPosition.y, worldPosition.z + 1)))
{
index += GenerateNorthWall(index, worldPosition, localPosition, materialInfo);
}
if (!terrain.IsPresent(new Vector3Int(worldPosition.x - 1, worldPosition.y, worldPosition.z)))
{
index += GenerateWestWall(index, worldPosition, localPosition, materialInfo);
}
if (!terrain.IsPresent(new Vector3Int(worldPosition.x + 1, worldPosition.y, worldPosition.z)))
{
index += GenerateEastWall(index, worldPosition, localPosition, materialInfo);
}
}
}
}
counts[0] = index;
}
private int GenerateTopWall(int index, Vector3Int worldPosition, Vector3Int chunkPosition, TerrainTypeMaterialInfo materialInfo)
{
int i = index * 4;
int j = index * 6;
// Looking along Y axis
// Bottom left
vertices[i] = new Vector3(chunkPosition.x * tileSize.x, chunkPosition.y * tileSize.y + tileSize.y, chunkPosition.z * tileSize.z);
// Top left
vertices[i + 1] = new Vector3(chunkPosition.x * tileSize.x, chunkPosition.y * tileSize.y + tileSize.y, chunkPosition.z * tileSize.z + tileSize.z);
// Top right
vertices[i + 2] = new Vector3(chunkPosition.x * tileSize.x + tileSize.x, chunkPosition.y * tileSize.y + tileSize.y, chunkPosition.z * tileSize.z + tileSize.z);
// Bottom right
vertices[i + 3] = new Vector3(chunkPosition.x * tileSize.x + tileSize.x, chunkPosition.y * tileSize.y + tileSize.y, chunkPosition.z * tileSize.z);
float uv = 1f / textureSize;
uv0[i] = new Vector2(worldPosition.x * uv, worldPosition.z * uv);
uv0[i + 1] = new Vector2(worldPosition.x * uv, worldPosition.z * uv + uv);
uv0[i + 2] = new Vector2(worldPosition.x * uv + uv, worldPosition.z * uv + uv);
uv0[i + 3] = new Vector2(worldPosition.x * uv + uv, worldPosition.z * uv);
colors[i] = new Color(materialInfo.shaderIndex, materialInfo.smoothness, 0, 0);
colors[i + 1] = new Color(materialInfo.shaderIndex, materialInfo.smoothness, 0, 0);
colors[i + 2] = new Color(materialInfo.shaderIndex, materialInfo.smoothness, 0, 0);
colors[i + 3] = new Color(materialInfo.shaderIndex, materialInfo.smoothness, 0, 0);
triangles[j] = i;
triangles[j + 1] = i + 1;
triangles[j + 2] = i + 2;
triangles[j + 3] = i;
triangles[j + 4] = i + 2;
triangles[j + 5] = i + 3;
return(1);
}
