Function SkinNormals

src/SB/Core/gc/iModel.cpp:533–606

}

static inline void SkinXform(xVec3* dest, const xVec3* vert, RwMatrix* mat, const RwMatrix* skinmat,
                             const F32* wt, const U32* idx, U32 count)
{
    U32 catMatFlags[2] = { 0, 0 };
    RwMatrix* catmat = (RwMatrix*)giAnimScratch;
    RwMatrix* rootmat = mat;
    mat++;

    while (count != 0)
    {
        for (U32 i = 0; i < 4; i++)
        {
            U32 r18 = ((*idx >> (i << 3)) >> 5) & 0x7;
            U32 r29 = 1 << ((*idx >> (i << 3)) & 0x1F);
            U32 midx = (*idx >> (i << 3)) & 0xFF;
            if (!(r29 & catMatFlags[r18]))
            {
                xMat4x3Mul((xMat4x3*)(catmat + midx), (const xMat4x3*)(skinmat + midx),
                           (const xMat4x3*)(mat + midx));
                catMatFlags[r18] |= r29;
            }
        }

        xVec3 accumV;
        accumV.x = accumV.y = accumV.z = 0.0f;

        RwMatrix* pMatrix;
        const F32* fwt = wt;
        U32 wtidx = *idx;
        U32 maxwt = 4;

        while (*fwt != 0.0f && maxwt)
        {
            pMatrix = catmat + (wtidx & 0xFF);

            accumV.x += *fwt * (pMatrix->right.x * vert->x + pMatrix->up.x * vert->y +
                                pMatrix->at.x * vert->z + pMatrix->pos.x);
            accumV.y += *fwt * (pMatrix->right.y * vert->x + pMatrix->up.y * vert->y +
                                pMatrix->at.y * vert->z + pMatrix->pos.y);
            accumV.z += *fwt * (pMatrix->right.z * vert->x + pMatrix->up.z * vert->y +
                                pMatrix->at.z * vert->z + pMatrix->pos.z);

            fwt++;
            wtidx >>= 8;
            maxwt--;
        }

        dest->x = rootmat->right.x * accumV.x + rootmat->up.x * accumV.y +
                  rootmat->at.x * accumV.z + rootmat->pos.x;
        dest->y = rootmat->right.y * accumV.x + rootmat->up.y * accumV.y +
                  rootmat->at.y * accumV.z + rootmat->pos.y;
        dest->z = rootmat->right.z * accumV.x + rootmat->up.z * accumV.y +
                  rootmat->at.z * accumV.z + rootmat->pos.z;

        vert++;
        idx++;
        wt += 4;
        count--;