[osg-users] transforming between coordinate systems of two subgraph

[Christian Buchner]

Hi,

thanks a lot. Now that I've got the solution in front of me, I must say....
that was obvious ;)

Christian


2015-07-16 17:35 GMT+02:00 Glenn Waldron <gwaldron at gmail.com>:

> coordA = (coordB * matrixTransformB->getMatrix()) * matrixTransformA
> ->getMatrix().inverse();
>
>
>
> Glenn Waldron / @glennwaldron
>
> On Thu, Jul 16, 2015 at 11:23 AM, Christian Buchner <
> christian.buchner at gmail.com> wrote:
>
>> Hi,
>>
>> I was having some problems with a coordinate transformation.
>>
>> root
>> matrixTransformA      matrixTransformB
>> subgraphA                subgraph B
>>
>> I have two subgraphs in my scene, each of which is a child of a unique
>> MatrixTransform.
>>
>> I now have to draw a line between an element from subgraph A to connect
>> to an element of subgraph B. I've decided to add this line into subgraphA
>> as a drawable - so both start and end point of this line have to be
>> specified in my "A" coordinate system.
>>
>> How would I transform a coordinate from subgraph B coordinate system into
>> the equivalent
>> coordinate valid within subgraph A, ideally using utility functions
>> provided by the OSG framework ? I would like to do that with minimal amount
>> of code.
>>
>> Excuse me for asking a basic linear algebra question, but I seem to be
>> stuck for good on this problem.
>>
>> Christian
>>
>>
>>
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>>
>
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