[x3d-public] SFRotation constructor axis argument by reference or value ?

[Andreas Plesch]

In the ecmascript SAI, SFRotation has a constructor which has the
rotation axis as a SFVec3f argument:

new SFRotation ( SFVec3f axis, numeric  angle )

https://www.web3d.org/documents/specifications/19777-1/V3.3/Part1/functions.html#SFRotation
(Table 7.18, -url in the first sentence is off-)

The question is when I make a new SFRotation and later change the
SFVec3f which was used for the axis, does the previously constructed
SFRotation also change ?

axis = new SFVec3f ( 0, 0, 1 );
rot = new SFRotation( axis, 3.14 );
axis.y = 1.0
axis.z = 0.0
// rot.y is ?
// constructed by value: rot.y = 0.0
// constructed by reference: rot.y = 1.0

I did not check the abstract SAI spec. for guidance so it is very
possible I missed something.

This is just an example. There are of course other constructors which
use objects as parameters. It is also probably rare that a script
would want to do this.

It may depend on the scripting language. In ecmascript objects are
passed by reference, you have to explicitly make a copy if you need
it. This is for performance. So I would guess for ecmascript it should
be rot.y = 1.0 .

-Andreas


-- 
Andreas Plesch
Waltham, MA 02453