void InitShader()
{
MeshFilter mf = GetComponent <MeshFilter>();
Bounds bounds = mf.sharedMesh.bounds;
Vector2 size = new Vector2(bounds.extents.x * transform.localScale.x, bounds.extents.z * transform.localScale.z);
Vector2 clumps = size;
Vector3 vec = transform.localScale / 0.1f * density;
clumps.x *= vec.x;
clumps.y *= vec.z;
int total = (int)clumps.x * (int)clumps.y;
kernelUpdateGrass = shader.FindKernel("UpdateGrass");
uint threadGroupSize;
shader.GetKernelThreadGroupSizes(kernelUpdateGrass, out threadGroupSize, out _, out _);
groupSize = Mathf.CeilToInt((float)total / (float)threadGroupSize);
int count = groupSize * (int)threadGroupSize;
clumpsArray = new GrassClump[count];
for (int i = 0; i < count; i++)
{
Vector3 pos = new Vector3(Random.value * size.x * 2 - size.x, 0, Random.value * size.y * 2 - size.y);
clumpsArray[i] = new GrassClump(pos);
}
clumpsBuffer = new ComputeBuffer(count, SIZE_GRASS_CLUMP);
clumpsBuffer.SetData(clumpsArray);
shader.SetBuffer(kernelUpdateGrass, "clumpsBuffer", clumpsBuffer);
shader.SetFloat("maxLean", maxLean * Mathf.PI / 180);
shader.SetFloat("trampleRadius", trampleRadius);
//TODO: Set wind vector
float theta = windDirection * Mathf.PI / 180;
Vector4 wind = new Vector4(Mathf.Cos(theta), Mathf.Sin(theta), windSpeed, windScale);
shader.SetVector("wind", wind);
timeID = Shader.PropertyToID("time");
tramplePosID = Shader.PropertyToID("tramplePos");
argsArray[0] = mesh.GetIndexCount(0);
argsArray[1] = (uint)count;
argsBuffer = new ComputeBuffer(1, 5 * sizeof(uint), ComputeBufferType.IndirectArguments);
argsBuffer.SetData(argsArray);
material.SetBuffer("clumpsBuffer", clumpsBuffer);
material.SetFloat("_Scale", scale);
visualizeNoise.SetVector("wind", wind);
}
void InitPositionsArray(int count, Bounds bounds)
{
clumpsArray = new GrassClump[count];
gameObject.AddComponent <MeshCollider>();
RaycastHit hit;
Vector3 v = new Vector3();
v.y = (bounds.center.y + bounds.extents.y);
v = transform.TransformPoint(v);
float castY = v.y;
v.Set(0, 0, 0);
v.y = (bounds.center.y - bounds.extents.y);
v = transform.TransformPoint(v);
float minY = v.y;
float range = castY - minY;
castY += 10;
int loopCount = 0;
int index = 0;
while (index < count && loopCount < (count * 10))
{
loopCount++;
Vector3 pos = new Vector3(
(Random.value * bounds.extents.x * 2 - bounds.extents.x) + bounds.center.x,
0,
(Random.value * bounds.extents.z * 2 - bounds.extents.z) + bounds.center.z);
pos = transform.TransformPoint(pos);
pos.y = castY;
if (Physics.Raycast(pos, Vector3.down, out hit))
{
pos.y = hit.point.y;
float deltaHeight = ((pos.y - minY) / range) * heightAffect;
if (Random.value > deltaHeight)
{
GrassClump clump = new GrassClump(pos);
clumpsArray[index++] = clump;
}
}
}
Debug.Log("GrassTerrain:InitPositionArray count:" + count + " index:" + index);
}
void InitShader()
{
MeshFilter mf = GetComponent <MeshFilter>();
Bounds bounds = mf.sharedMesh.bounds;
Vector3 clumps = bounds.extents;
Vector3 vec = transform.localScale / 0.1f * density;
clumps.x *= vec.x;
clumps.z *= vec.z;
int total = (int)clumps.x * (int)clumps.z;
kernelLeanGrass = shader.FindKernel("LeanGrass");
uint threadGroupSize;
shader.GetKernelThreadGroupSizes(kernelLeanGrass, out threadGroupSize, out _, out _);
groupSize = Mathf.CeilToInt((float)total / (float)threadGroupSize);
int count = groupSize * (int)threadGroupSize;
clumpsArray = new GrassClump[count];
for (int i = 0; i < count; i++)
{
Vector3 pos = new Vector3(Random.value * bounds.extents.x * 2 - bounds.extents.x + bounds.center.x,
0,
Random.value * bounds.extents.z * 2 - bounds.extents.z + bounds.center.z);
pos = transform.TransformPoint(pos);
clumpsArray[i] = new GrassClump(pos);
}
clumpsBuffer = new ComputeBuffer(count, SIZE_GRASS_CLUMP);
clumpsBuffer.SetData(clumpsArray);
shader.SetBuffer(kernelLeanGrass, "clumpsBuffer", clumpsBuffer);
shader.SetFloat("maxLean", maxLean * Mathf.PI / 180);
timeID = Shader.PropertyToID("time");
argsArray[0] = mesh.GetIndexCount(0);
argsArray[1] = (uint)count;
argsBuffer = new ComputeBuffer(1, 5 * sizeof(uint), ComputeBufferType.IndirectArguments);
argsBuffer.SetData(argsArray);
material.SetBuffer("clumpsBuffer", clumpsBuffer);
material.SetFloat("_Scale", scale);
}
