[Bf-committers] RE_rayobject_raycast divide by zero

[André Susano Pinto]

Yes it was intentional (if i recall correctly)

its only used to calculate bv_indexs (only signal matters)
and then its used on raycasting against BB but by using code that deals well
with that.


On 3 February 2010 14:28, Campbell Barton <ideasman42 at gmail.com> wrote:

> noticed RE_rayobject_raycast will often divide by zero, perhaps this
> is ok but seems like it could lead to problems,
> is this intentional?
>
> ---- rayobject.cpp:383
> isec->idot_axis[i]              = 1.0f / isec->vec[i];
> ----
>
> int RE_rayobject_raycast(RayObject *r, Isect *isec)
> {
>        int i;
>        RE_RC_COUNT(isec->raycounter->raycast.test);
>
>        /* Setup vars used on raycast */
>        isec->dist = len_v3(isec->vec);
>
>        for(i=0; i<3; i++)
>        {
>                isec->idot_axis[i]              = 1.0f / isec->vec[i];
>
>                isec->bv_index[2*i]             = isec->idot_axis[i] < 0.0 ?
> 1 : 0;
>                isec->bv_index[2*i+1]   = 1 - isec->bv_index[2*i];
>
>                isec->bv_index[2*i]             = i+3*isec->bv_index[2*i];
>                isec->bv_index[2*i+1]   = i+3*isec->bv_index[2*i+1];
>        }
>
> --
> - Campbell
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