forced render instead of preview?

module roundedSquareNotMinkowski(height=1, x=squareSide, y=squareSide, cornerRad=baseCornerRadius) {
// forces render instead of preview on open, if using this instead of minkowsky one
    actualCornerRadius = min(x/2, y/2, cornerRad);
    xx=max(smidge, x/2-actualCornerRadius); yy=max(smidge, y/2-actualCornerRadius);
    if (cornerRad > 0.01) {     ch=height+smidge;
        hull() {
            for(i=[-1:2:1]) { for(j=[-1:2:1]) {
                translate([i*xx,j*yy,0]) cylinder(h = ch, r=actualCornerRadius, center=true, $fn=circFnCalc(actualCornerRadius));
        }   }   }
    } else {    sm3=smidge*3;
        hull() {
            for(i=[-1:2:1]) { for(j=[-1:2:1]) {
                translate([i*xx,j*yy,0]) cube([smidge,smidge,sm3], center=true);
        }   }   }
    }
}

module roundedSquare(height=1, x=squareSide, y=squareSide, cornerRad=baseCornerRadius) {
	actualCornerRadius = min(x/2, y/2, cornerRad);
	minkowski() {
		cube(size=[max(smidge, x-(2*actualCornerRadius)), max(smidge, y-(2*actualCornerRadius)), height], center=true);
		if (cornerRad > 0.01) { cylinder(r1=actualCornerRadius, r2=actualCornerRadius, h=smidge, center=true, $fn=circFnCalc(actualCornerRadius));
            } else { cube([smidge, smidge, smidge]); }
	}
}