[Bf-committers] Blender tangent space calculation

[Morten Mikkelsen]

 >If you want to use the indexed result within a Blender context you'd have
to put a dummy vertex at the beginning of the vertex array >such that all
other vertices are offset by one entry

I mean put a dummy vertex in front of the unique vertices of course
(meaning after welding). And also +1 to the indices you get after welding.



On Sat, Nov 19, 2011 at 12:35 PM, Morten Mikkelsen <mikkelsen7 at gmail.com>wrote:

> I am not 100% sure I understand you correctly but your fix doesn't sound
> correct but perhaps
> I am misunderstanding you. Anyway, the welder is going to generate a zero
> based index list unlike what is used within
> Blender. If you want to use the indexed result within a Blender context
> you'd have to put a dummy vertex at the beginning of the vertex array such
> that all other vertices are offset by one entry and then you'd add all the
> welder-generated indices by +1 to offset to after the dummy vertex. This
> way triangles can still have their fourth index as 0 which points to the
> dummy vertex and within Blender means no vertex assigned.
>
>
>
>
> On Sat, Nov 19, 2011 at 9:27 AM, Eugene Minov <minov.eug at gmail.com> wrote:
>
>> >
>> > >Correct, this is how blender does it everywhere in its code-base.
>> >
>>
>> Ok.
>> I've asked because after weldind I've gotten this problem with some quads.
>> But today seems that I solve it by swapping the first vertex in the vert
>> array with
>> the first finded vertex that is not indexed to any of the 4'th face's
>> index.
>>
>> On Sat, Nov 19, 2011 at 1:13 AM, Morten Mikkelsen <mikkelsen7 at gmail.com
>> >wrote:
>>
>> > >
>> > > I wanted to ask about this line:
>> > > const int iGetNrVerts= data->mface[face_num].v4!=0 ? 4 : 3;
>> > >
>> > > Or there is no way that last index points to zero?
>> > >
>> >
>> > Correct, this is how blender does it everywhere in its code-base.
>> > Super glad to hear you're getting useful results! Be sure to submit a
>> patch
>> > for review.
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>