world2screen

bool ScreenTransform(const Vector &point, Vector &screen)
    float w;
    const VMatrix &worldToScreen = I::EngineClient->WorldToScreenMatrix();

    screen.x = worldToScreen[0][0] * point[0] + worldToScreen[0][1] * point[1] + worldToScreen[0][2] * point[2] + worldToScreen[0][3];
    screen.y = worldToScreen[1][0] * point[0] + worldToScreen[1][1] * point[1] + worldToScreen[1][2] * point[2] + worldToScreen[1][3];
    w = worldToScreen[3][0] * point[0] + worldToScreen[3][1] * point[1] + worldToScreen[3][2] * point[2] + worldToScreen[3][3];
    screen.z = 0.0f;

    bool behind = false;

    if (w < 0.001f) {
        behind = true;
        screen.x *= 100000;
        screen.y *= 100000;
    }
    else {
        behind = false;
        float invw = 1.0f / w;
        screen.x *= invw;
        screen.y *= invw;
    }

    return behind;
}

bool WorldToScreen(const Vector &origin, Vector &screen) {
    if (!ScreenTransform(origin, screen)) {
        int ScreenWidth, ScreenHeight;
        I::EngineClient->GetScreenSize(ScreenWidth, ScreenHeight);
        float x = ScreenWidth / 2;
        float y = ScreenHeight / 2;
        x += 0.5 * screen.x * ScreenWidth + 0.5;
        y -= 0.5 * screen.y * ScreenHeight + 0.5;
        screen.x = x;
        screen.y = y;
        return true;
    }

    return false;
}