HairCalculateRenderPositions.h

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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
// SPDX-FileCopyrightText: 2026 Jorrit Rouwe
// SPDX-License-Identifier: MIT
 
float3 SkinRenderVertex(uint inVertexIndex)
{
    // Calculating resulting render position
    float3 out_position = float3(0, 0, 0);
    for (uint idx = inVertexIndex * cHairNumSVertexInfluences, idx_end = idx + cHairNumSVertexInfluences; idx < idx_end; ++idx)
    {
        JPH_HairSVertexInfluence inf = gSVertexInfluences[idx];
        JPH_HairPosition sim_vtx = gPositions[inf.mVertexIndex];
        out_position += inf.mWeight * (sim_vtx.mPosition + JPH_QuatMulVec3(sim_vtx.mRotation, inf.mRelativePosition));
    }
    return out_position;
}