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Add Conform to Global SDF to GPU particles

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This commit is contained in:
Wojciech Figat
2022-03-25 15:36:00 +01:00
parent 6c4e61a924
commit a917397090
7 changed files with 79 additions and 7 deletions
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32
Source/Engine/Particles/Graph/GPU/ParticleEmitterGraph.GPU.ParticleModules.cpp
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@@ -877,6 +877,38 @@ void ParticleEmitterGPUGenerator::ProcessModule(Node* node)
);
break;
}
// Conform to Global SDF
case 335:
{
auto position = AccessParticleAttribute(node, nodeGpu->Attributes[0], AccessMode::Read);
auto velocity = AccessParticleAttribute(node, nodeGpu->Attributes[1], AccessMode::ReadWrite);
auto mass = AccessParticleAttribute(node, nodeGpu->Attributes[2], AccessMode::Read);
const Value attractionSpeed = GetValue(node->GetBox(0), 2).AsFloat();
const Value attractionForce = GetValue(node->GetBox(1), 3).AsFloat();
const Value stickDistance = GetValue(node->GetBox(2), 4).AsFloat();
const Value stickForce = GetValue(node->GetBox(3), 5).AsFloat();
auto param = findOrAddGlobalSDF();
_includes.Add(TEXT("./Flax/GlobalSignDistanceField.hlsl"));
_writer.Write(
TEXT(
" {{\n"
" // Conform to Global SDF\n"
" float dist;\n"
" float3 dir = normalize(SampleGlobalSDFGradient({3}, {3}_Tex, {0}, dist));\n"
" if (dist > 0) dir *= -1;\n"
" float distToSurface = abs(dist);\n"
" float spdNormal = dot(dir, {1});\n"
" float ratio = smoothstep(0.0f, {6} * 2.0f, distToSurface);\n"
" float tgtSpeed = {4} * ratio;\n"
" float deltaSpeed = tgtSpeed - spdNormal;\n"
" float3 deltaVelocity = dir * (sign(deltaSpeed) * min(abs(deltaSpeed), DeltaTime * lerp({7}, {5}, ratio)) / max({2}, PARTICLE_THRESHOLD));\n"
" if (dist < 500) {1} += deltaVelocity;\n"
" }}\n"
), position.Value, velocity.Value, mass.Value, param.ShaderName, attractionSpeed.Value, attractionForce.Value, stickDistance.Value, stickForce.Value);
break;
}
#undef COLLISION_BEGIN
#undef COLLISION_LOGIC