void UpdateBuffers()
{
var mesh = _meshRenderer.sharedMesh;
var material = _meshRenderer.material;
_positionBuffer = new ComputeBuffer(_count, 16);
Vector4[] positions = new Vector4[_count];
for (int i = 0; i < _count; i++)
{
float angle = Random.Range(0.0f, Mathf.PI * 2.0f);
float distance = Random.Range(20.0f, 100.0f);
float height = Random.Range(-2.0f, 2.0f);
float size = Random.Range(0.05f, 0.25f);
positions[i] = new Vector4(Mathf.Sin(angle) * distance, height, Mathf.Cos(angle) * distance, size);
}
_positionBuffer.SetData(positions);
material.SetBuffer("positionBuffer", _positionBuffer);
_args[0] = mesh.GetIndexCount(0);
_args[1] = (uint)_count;
_argsBuffer.SetData(_args);
Graphics.DrawMeshInstancedIndirect(mesh, 0, material, new Bounds(Vector3.zero, 1000000 * Vector3.one), _argsBuffer, 0, new MaterialPropertyBlock(), ShadowCastingMode.Off, true);
}
void Update()
{
// Update starting position buffer
if (cachedInstanceCount != instanceCount || cachedSubMeshIndex != subMeshIndex)
{
UpdateBuffers();
}
// Pad input
if (Input.GetAxisRaw("Horizontal") != 0.0f)
{
instanceCount = (int)Mathf.Clamp(instanceCount + Input.GetAxis("Horizontal") * 40000, 1.0f, 5000000.0f);
}
// Render
Graphics.DrawMeshInstancedIndirect(instanceMesh, subMeshIndex, instanceMaterial, new Bounds(Vector3.zero, new Vector3(100.0f, 100.0f, 100.0f)), argsBuffer);
}