public void SetParameters(uint seed)
{
var hash = new XXHash(seed);
_props.SetFloat(_seed1Key, hash.Float(0));
_props.SetFloat(_seed2Key, hash.Float(1));
}
void Start()
{
var hash = new XXHash(_randomSeed);
var mat = new MaterialOverride(_randomSeed);
var parent = transform;
var rot = quaternion.identity;
// Column - Row - Depth
for (var col = 0u; col < _extent.x; col++)
{
for (var row = 0u; row < _extent.y; row++)
{
// Per-strip parameters
var seed = hash.UInt(col) + hash.UInt(row);
mat.SetParameters(seed + 500);
for (var depth = 0u; depth < _extent.z; depth++)
{
// Random removal
if (hash.Float(seed + depth) < _removalRate)
{
continue;
}
// Instance position
var p = math.float3(col, row, depth);
p.xy = p.xy - _extent.xy / 2 + math.float2(0, 0.5f);
// Instantiation and material overriding
mat.Apply(Instantiate(_prefab, p, rot, parent));
}
}
}
}
void UpdateAnimationParameters()
{
var dt = Time.deltaTime;
// Update the noise parameter.
_noise.x += _noiseFrequency * dt;
// Step parameter delta
var delta = _stepFrequency * dt;
// Check if the current step still continues.
if (StepCount == (int)(_step + delta))
{
// The current step is still going:
// Recalculate the non-pivot foot position.
_feet[(int)NonPivotSide] =
_feet[(int)PivotSide] + CurrentStepDirection * _footDistance;
// Update the step parameter.
_step += delta;
}
else
{
// The current step ends in this frame:
// Put the foot at the destination.
_feet[(int)NonPivotSide] = CurrentStepDestination;
// Update the step parameter.
_step += delta;
// Randomly flip the direction.
if (_hash.Float(StepSeed) > 0.5f)
{
_stepFlip *= -1;
}
// Check if the next destination is in the maxDistance range.
var origin = transform.position;
var dist = math.distance(CurrentStepDestination, origin);
if (dist > _maxDistance)
{
// Try flipping the turn direction. Revert it if it makes the
// destination further from the origin.
_stepFlip *= -1;
if (dist < math.distance(CurrentStepDestination, origin))
{
_stepFlip *= -1;
}
}
}
}
void Start()
{
var hash = new XXHash(_randomSeed);
var mat = new MaterialOverride(_randomSeed);
var parent = transform;
// Column - Row - Edge x3 - Depth
for (var col = 0u; col < _extent.x; col++)
{
for (var row = 0u; row < _extent.y; row++)
{
// Tube origin
var org = math.float2(col, row) - _extent.xy / 2;
org.x += (row & 1) * 0.5f;
org *= math.float2(3, 0.87f);
for (var i = 0u; i < 3u; i++)
{
// Per-strip random seed
var seed = hash.UInt(col) + hash.UInt(row) + i;
// Per-strip random material properties
mat.SetParameters(seed + 500);
// Rotation
var phi = (i - 1.0f) * math.PI / 3;
var rot = quaternion.RotateZ(phi);
// Position
var pos = math.mul(rot, math.float3(0, 0.87f, 0));
pos.xy += org;
for (var depth = 0u; depth < _extent.z; depth++)
{
// Random removal
if (hash.Float(seed + depth) < _removalRate)
{
continue;
}
// Instantiation and material overriding
pos.z = depth;
mat.Apply(Instantiate(_prefab, pos, rot, parent));
}
}
}
}
}
public void Execute(int i)
{
var e = Elements[i];
var hash = new XXHash((uint)i);
// Source triangle vertices
var v1 = e.Vertex1;
var v2 = e.Vertex2;
var v3 = e.Vertex3;
// Source position (triangle centroid)
var p = (v1 + v2 + v3) / 3;
// Effect parameter
var eff = -math.mul(Effector, math.float4(p, 1)).z;
eff -= hash.Float(0.4f, 4773); // Random distribution
// Triangle shrink
var tmod = math.saturate(eff);
v1 = math.lerp(v1, p, tmod);
v2 = math.lerp(v2, p, tmod);
v3 = math.lerp(v3, p, tmod);
// Motion by noise
var offs = MathUtil.DFNoise(p * 3.3f) * 0.02f;
offs *= math.smoothstep(0, 1, eff);
v1 += offs;
v2 += offs;
v3 += offs;
// Normal/tangent
var nrm = MathUtil.UnitOrtho(v2 - v1, v3 - v1);
var tan = MathUtil.AdHocTangent(nrm);
// UV and material parameters
var em = math.saturate(eff * 10);
var uv1 = math.float4(e.UV1, em, em);
var uv2 = math.float4(e.UV2, em, em);
var uv3 = math.float4(e.UV3, em, em);
// Output
Output[i] = new Triangle(new Vertex(v1, nrm, tan, 0, uv1),
new Vertex(v2, nrm, tan, 0, uv2),
new Vertex(v3, nrm, tan, 0, uv3));
}
void Update()
{
// Noise update
_noise.x += _noiseFrequency * Time.deltaTime;
// Step time delta
var delta = _stepFrequency * Time.deltaTime;
// Right vector (a vector indicating from left foot to right foot)
// Renormalized every frame to apply _footDistance changes.
var right = (_feet[1] - _feet[0]).normalized * _footDistance;
// Check if the current step ends in this frame.
if (StepCount == Mathf.FloorToInt(_step + delta))
{
// The current step keeps going:
// Recalculate the non-pivot foot position.
// (To apply _footDistance changes)
if (PivotIsLeft)
{
_feet[1] = _feet[0] + right;
}
else
{
_feet[0] = _feet[1] - right;
}
// Update the step time
_step += delta;
}
else
{
// The current step is going to end:
// Update the next pivot point;
_feet[PivotIsLeft ? 1 : 0] = CurrentStepDestination;
// Update the step time
_step += delta;
// Flip the turn direction randomly.
if (_hash.Float(StepSeed) > 0.5f)
{
_stepSign *= -1;
}
// Check if the next destination is in the range.
var dist = (CurrentStepDestination - transform.position).magnitude;
if (dist > _maxDistance)
{
// The next destination is out of the range:
// Try flipping the turn direction. Use it if it makes
// the destination closer to the origin. Revert it if not.
_stepSign *= -1;
if (dist < (CurrentStepDestination - transform.position).magnitude)
{
_stepSign *= -1;
}
}
}
// Update the chest matrices for use in OnAnimatorIK.
var chest = _animator.GetBoneTransform(HumanBodyBones.Chest);
_chestMatrix = chest.localToWorldMatrix;
_chestMatrixInv = chest.worldToLocalMatrix;
}
public void Execute(int i)
{
var e = Elements[i];
var hash = new XXHash((uint)i);
// Source triangle vertices
var v1 = e.Vertex1;
var v2 = e.Vertex2;
var v3 = e.Vertex3;
// Source position (triangle centroid)
var p = (v1 + v2 + v3) / 3;
// Effect parameter
var eff = -MathUtil.Transform(Effector, p).z;
eff -= hash.Float(0.4f, 3244); // Random distribution
// Triangle deformation (expand very fast)
var tmod = 1 + math.smoothstep(0, 0.3f, eff) * 30;
v1 = math.lerp(p, v1, tmod);
v2 = math.lerp(p, v2, tmod);
v3 = math.lerp(p, v3, tmod);
// Voxel motion by noise (stops before travelling)
var nmod = 1 - math.smoothstep(0.6f, 0.7f, eff);
var nfp = p * 3.3f + math.float3(0, eff * 0.4f, 0);
p += MathUtil.DFNoise(nfp) * 0.004f * nmod;
// Voxel moving out
var mout = math.smoothstep(0.7f, 1.3f, eff);
p.z -= mout * 2;
// Voxel scaling
var vs = 0.03f * math.float2(1 - mout, 1 + mout * 30).xxy;
// Voxel vertices
var vv1 = p + math.float3(-1, -1, -1) * vs;
var vv2 = p + math.float3(+1, -1, -1) * vs;
var vv3 = p + math.float3(-1, +1, -1) * vs;
var vv4 = p + math.float3(+1, +1, -1) * vs;
var vv5 = p + math.float3(-1, -1, +1) * vs;
var vv6 = p + math.float3(+1, -1, +1) * vs;
var vv7 = p + math.float3(-1, +1, +1) * vs;
var vv8 = p + math.float3(+1, +1, +1) * vs;
// Triangle to voxel deformation
var vmod = math.smoothstep(0.1f, 0.3f, eff);
vv1 = math.lerp(v1, vv1, vmod);
vv2 = math.lerp(v2, vv2, vmod);
vv3 = math.lerp(v3, vv3, vmod);
vv4 = math.lerp(v3, vv4, vmod);
vv5 = math.lerp(v1, vv5, vmod);
vv6 = math.lerp(v2, vv6, vmod);
vv7 = math.lerp(v3, vv7, vmod);
vv8 = math.lerp(v3, vv8, vmod);
// UV and material parameters
var mat = math.saturate(eff * 10);
var emm = mat - vmod +
math.smoothstep(0.6f, 0.7f, eff) * hash.Float(1.1f, 2.1f, 1893);
var uv1 = math.float4(e.UV1, mat, emm);
var uv2 = math.float4(e.UV2, mat, emm);
var uv3 = math.float4(e.UV3, mat, emm);
// Output
Output[i] = new VoxelOutput
(vv1, uv1, vv2, uv2, vv3, uv3, vv4, uv3,
vv5, uv1, vv6, uv2, vv7, uv3, vv8, uv3);
}