Function zVolume_OccludePrecalc

src/SB/Game/zVolume.cpp:70–186

void zVolume_OccludePrecalc(xVec3* camPos)
{
    S32 i;
    S32 j;
    xVec3 corner[5];
    zVolume* vol;
    xVolumeAsset* a;
    F32 c;
    F32 s;
    PreCalcOcclude* calc;
    xVec3 d1;
    xVec3 d2;
    xVec4 locFrustVec[4];
    F32 depthdot;
    F32 camdot;
    F32 testdot1;
    F32 testdot2;

    gOccludeCalcCount = 0;

    for (i = 0; i < gOccludeCount; i++)
    {
        vol = gOccludeList[i];
        a = vol->asset;

        c = icos(a->rot);
        s = isin(a->rot);

        calc = &gOccludeCalc[gOccludeCalcCount];

        corner[0].x = c * (a->bound.box.box.lower.x - a->xpivot) + a->xpivot;
        corner[0].y = a->bound.box.box.lower.y;
        corner[0].z = s * (a->bound.box.box.lower.x - a->xpivot) + a->bound.box.box.lower.z;

        corner[1].y = a->bound.box.box.lower.y;
        corner[1].x = c * (a->bound.box.box.upper.x - a->xpivot) + a->xpivot;
        corner[1].z = s * (a->bound.box.box.upper.x - a->xpivot) + a->bound.box.box.lower.z;

        corner[2].x = c * (a->bound.box.box.upper.x - a->xpivot) + a->xpivot;
        corner[2].y = a->bound.box.box.upper.y;
        corner[2].z = s * (a->bound.box.box.upper.x - a->xpivot) + a->bound.box.box.lower.z;

        corner[3].x = c * (a->bound.box.box.lower.x - a->xpivot) + a->xpivot;
        corner[3].y = a->bound.box.box.upper.y;
        corner[3].z = s * (a->bound.box.box.lower.x - a->xpivot) + a->bound.box.box.lower.z;

        corner[4] = corner[0];

        xVec3Sub(&d1, &corner[1], &corner[0]);
        xVec3Sub(&d2, &corner[2], &corner[0]);

        xVec3Cross((xVec3*)calc, &d1, &d2);
        xVec3Normalize((xVec3*)calc, (xVec3*)calc);

        depthdot = xVec3Dot((xVec3*)calc, &corner[0]);
        camdot = xVec3Dot((xVec3*)calc, camPos);

        if (camdot > depthdot)
        {
            xVec3Inv((xVec3*)calc, (xVec3*)calc);