Thread Subject:

Homogeneous Transformation Matrix

Hello,
I have a Homogeneous Transformation Matrix 4x4 which describes a
location and orientation of a coordinate system. Is there a function
which can plot this coordinate system?
Hope you understood and thanks.
Guy

In article <ef2b2bf.-1@webx.raydaftYaTP>, Guy <guyfn@zahav.net.il> wrote:

> Hello,
> I have a Homogeneous Transformation Matrix 4x4 which describes a
> location and orientation of a coordinate system. Is there a function
> which can plot this coordinate system?
> Hope you understood and thanks.
> Guy
------------------------
  By your use of the word "homogeneous", it sounds as if you are rotating
coordinate systems about their origin. If so, what kind of "plotting" do
you have in mind in four dimensions? Or do I misunderstand you?

(Remove "xyzzy" and ".invalid" to send me email.)
Roger Stafford

> ------------------------
> By your use of the word "homogeneous", it sounds as if you are
> rotating
> coordinate systems about their origin. If so, what kind of
> "plotting" do
> you have in mind in four dimensions? Or do I misunderstand you?
>
> (Remove "xyzzy" and ".invalid" to send me email.)
> Roger Stafford
>

Thanks.
I rotated and moved the coordinate system. I performed it by
multiplying a homogeneous rotation matrix and a homogeneous
translation matrix, and I need to show the new location I received in
a 3D plot.
Thank you,
Guy

"Guy" <guyfn@zahav.net.il> wrote in message
news:ef2b2bf.1@webx.raydaftYaTP...
>> ------------------------
>> By your use of the word "homogeneous", it sounds as if you are
>> rotating
>> coordinate systems about their origin. If so, what kind of
>> "plotting" do
>> you have in mind in four dimensions? Or do I misunderstand you?
>>
>> (Remove "xyzzy" and ".invalid" to send me email.)
>> Roger Stafford
>>
>
> Thanks.
> I rotated and moved the coordinate system. I performed it by
> multiplying a homogeneous rotation matrix and a homogeneous
> translation matrix, and I need to show the new location I received in
> a 3D plot.
> Thank you,
> Guy

MATLAB does not have anything that operates directly on homogeneous
coordinates. You'll have to transform them back to ordinary rectangular
coordinates.

"Ken Davis" <kendavis.nospam@alum.mit.edu> wrote in message
news:67477D375FABAF0D93ECF685345BD37B@in.webx.raydaftYaTP...
> "Guy" <guyfn@zahav.net.il> wrote in message
> news:ef2b2bf.1@webx.raydaftYaTP...
>>> ------------------------
>>> By your use of the word "homogeneous", it sounds as if you are
>>> rotating
>>> coordinate systems about their origin. If so, what kind of
>>> "plotting" do
>>> you have in mind in four dimensions? Or do I misunderstand you?
>>>
>>> (Remove "xyzzy" and ".invalid" to send me email.)
>>> Roger Stafford
>>>
>>
>> Thanks.
>> I rotated and moved the coordinate system. I performed it by
>> multiplying a homogeneous rotation matrix and a homogeneous
>> translation matrix, and I need to show the new location I received in
>> a 3D plot.
>> Thank you,
>> Guy
>
> MATLAB does not have anything that operates directly on homogeneous
> coordinates. You'll have to transform them back to ordinary rectangular
> coordinates.
I may have been wrong... it's possible that viewmtx may help you.