# Thread Subject: Homogeneous Transformation Matrix

 Subject: Homogeneous Transformation Matrix From: Guy Date: 6 Mar, 2006 16:53:34 Message: 1 of 5 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
 Subject: Homogeneous Transformation Matrix Date: 6 Mar, 2006 22:38:44 Message: 2 of 5 In article , Guy 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
 Subject: Homogeneous Transformation Matrix From: Guy Date: 7 Mar, 2006 00:49:22 Message: 3 of 5 > ------------------------ > 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
 Subject: Homogeneous Transformation Matrix From: Ken Davis Date: 7 Mar, 2006 07:40:25 Message: 4 of 5 "Guy" 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.
 Subject: Homogeneous Transformation Matrix From: Ken Davis Date: 7 Mar, 2006 17:05:17 Message: 5 of 5 "Ken Davis" wrote in message news:67477D375FABAF0D93ECF685345BD37B@in.webx.raydaftYaTP... > "Guy" 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.

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