surface_centroid()

glm::vec3 MayaFlux::Kinesis::surface_centroid ( std::span< const std::byte >  bytes, size_t  stride, size_t  offset, std::span< const uint32_t >  indices  )

inlinenoexcept

Area-weighted centroid of the triangles of an indexed mesh.

Each triangle contributes its own centroid weighted by its area, so dense tessellation does not pull the result the way a vertex mean does. A triangle with an index outside bytes is skipped.

Parameters

bytes	Interleaved vertex records.
stride	Bytes per record.
offset	Byte offset of the vec3 position within a record.
indices	Triangle list, three indices per face.

Returns

Surface centroid, or the vertex centroid when there is no triangle of nonzero area.

Definition at line 204 of file Morphology.hpp.

{
    glm::vec3 acc(0.0F);
    float total = 0.0F;
    for (size_t t = 0; t + 2 < indices.size(); t += 3) {
        const auto a = position_at(bytes, stride, offset, indices[t]);
        const auto b = position_at(bytes, stride, offset, indices[t + 1]);
        const auto c = position_at(bytes, stride, offset, indices[t + 2]);
        if (!a || !b || !c)
            continue;
        const float area = 0.5F * glm::length(glm::cross(*b - *a, *c - *a));
        acc += (*a + *b + *c) * (area / 3.0F);
        total += area;
    }
    return total > 0.0F ? acc / total : centroid(bytes, stride, offset);
}

References a, b, centroid(), indices, offset, position_at(), and total.

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