Re: Problems with gluUnProject
Posted by Sven Gothel on May 07, 2012; 12:18am
URL: https://forum.jogamp.org/Problems-with-gluUnProject-tp3954975p3967522.html
On 05/06/2012 01:44 AM, Wade Walker [via jogamp] wrote:
> I looked at this some more, and found that Project.__gluMultMatricesd()
> multiplies the matrices "backwards" from FloatUtil.multMatrixf().
>
> It looks like ProjectFloat.java changed from using gluMultMatricesf() to
> FloatUtil.multMatrixf() a few weeks ago. Sven may not have realized that
> gluMultMatricesf() was a column-major multiply instead of a row-major
> multiply, so he might have switched out these methods thinking they did the
> same thing.
Oops, may bad. So we should swap the multiplication arguments here right ?
>
> Are you using the latest autobuild of JOGL, or a recent release candidate? If
> so, try using an older version (one at least three months old) and see if this
> bad behavior goes away. If so, that will confirm that this is a recently
> introduced bug.
>
> I'll try writing a unit test for gluProject and gluUnproject to nail this
> behavior down and make sure these functions do exactly what they're supposed
> to. There doesn't appear to be any test coverage for these right now, so
> having a few tests would definitely help.Very good, thank you Wade.
BTW: Jenkins will be back up at end of May .. until then,
we have to use the source and our local tests.
~Sven
URL: https://forum.jogamp.org/Problems-with-gluUnProject-tp3954975p3967522.html
On 05/06/2012 01:44 AM, Wade Walker [via jogamp] wrote:
> I looked at this some more, and found that Project.__gluMultMatricesd()
> multiplies the matrices "backwards" from FloatUtil.multMatrixf().
>
> It looks like ProjectFloat.java changed from using gluMultMatricesf() to
> FloatUtil.multMatrixf() a few weeks ago. Sven may not have realized that
> gluMultMatricesf() was a column-major multiply instead of a row-major
> multiply, so he might have switched out these methods thinking they did the
> same thing.
Oops, may bad. So we should swap the multiplication arguments here right ?
>
> Are you using the latest autobuild of JOGL, or a recent release candidate? If
> so, try using an older version (one at least three months old) and see if this
> bad behavior goes away. If so, that will confirm that this is a recently
> introduced bug.
>
> I'll try writing a unit test for gluProject and gluUnproject to nail this
> behavior down and make sure these functions do exactly what they're supposed
> to. There doesn't appear to be any test coverage for these right now, so
> having a few tests would definitely help.
BTW: Jenkins will be back up at end of May .. until then,
we have to use the source and our local tests.
~Sven
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