private Vector3 CalculateNormal(int x, int z, float[,] noiseMap)
{
if (x == 0)
{
x = 1;
}
if (z == 0)
{
z = 1;
}
if (z == (VERTEX_COUNT - 1))
{
z = (VERTEX_COUNT - 2);
}
if (x == (VERTEX_COUNT - 1))
{
x = (VERTEX_COUNT - 2);
}
float heightL = JMathUtils.HeightCurve2(noiseMap[x - 1, z]) * MAX_HEIGHT;
float heightR = JMathUtils.HeightCurve2(noiseMap[x + 1, z]) * MAX_HEIGHT;
float heightD = JMathUtils.HeightCurve2(noiseMap[x, z - 1]) * MAX_HEIGHT;
float heightU = JMathUtils.HeightCurve2(noiseMap[x, z + 1]) * MAX_HEIGHT;
Vector3 normal = new Vector3(heightL - heightR, 2f, heightD - heightU);
normal.Normalize();
return(normal);
}
private JRawModel generateTerrain(JLoader loader)
{
Console.WriteLine("Generating terrain...");
float[,] test = JNoise.GenerateNoiseMap(100, 100, 20.0f, 4, 0.5f, 2.0f);
int count = VERTEX_COUNT * VERTEX_COUNT;
heights = new float[VERTEX_COUNT, VERTEX_COUNT];
float[] vertices = new float[count * 3];
float[] normals = new float[count * 3];
float[] textureCoords = new float[count * 2];
uint[] indices = new uint[6 * (VERTEX_COUNT - 1) * (VERTEX_COUNT - 1)];
int vertexPointer = 0;
for (int i = 0; i < VERTEX_COUNT; i++)
{
for (int j = 0; j < VERTEX_COUNT; j++)
{
vertices[vertexPointer * 3] = (float)j / ((float)VERTEX_COUNT - 1) * SIZE;
float height = JMathUtils.HeightCurve2(test[j, i]) * MAX_HEIGHT;
vertices[vertexPointer * 3 + 1] = height;
heights[j, i] = height;
vertices[vertexPointer * 3 + 2] = (float)i / ((float)VERTEX_COUNT - 1) * SIZE;
Vector3 normal = CalculateNormal(j, i, test);
normals[vertexPointer * 3] = normal.X;
normals[vertexPointer * 3 + 1] = normal.Y;
normals[vertexPointer * 3 + 2] = normal.Z;
textureCoords[vertexPointer * 2] = (float)j / ((float)VERTEX_COUNT - 1);
textureCoords[vertexPointer * 2 + 1] = (float)i / ((float)VERTEX_COUNT - 1);
vertexPointer++;
}
}
int pointer = 0;
for (uint gz = 0; gz < VERTEX_COUNT - 1; gz++)
{
for (uint gx = 0; gx < VERTEX_COUNT - 1; gx++)
{
uint topLeft = (uint)(gz * VERTEX_COUNT) + gx;
uint topRight = topLeft + 1;
uint bottomLeft = (uint)((gz + 1) * VERTEX_COUNT) + gx;
uint bottomRight = bottomLeft + 1;
indices[pointer++] = topLeft;
indices[pointer++] = bottomLeft;
indices[pointer++] = topRight;
indices[pointer++] = topRight;
indices[pointer++] = bottomLeft;
indices[pointer++] = bottomRight;
}
}
Console.WriteLine("Terrain generation complete...");
return(loader.LoadToVAO(vertices, textureCoords, normals, indices));
}
