Re: [Emc-developers] Error in backplot with backtool set up in lathes

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Thank you (and Kirk) for showing the write direction.

    This bug only happens in lathes that the user uses the .axisrc like
described in: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?BackToolLathe

    Not sure the number of people using a lathe with backtoopost, so I am
unaware if this issue is relevant.

    In this case, for any tool with diameter != 0, the backplot does not
displays the tool. It simply shows some points on the screen, that flick a
bit. It is like the tool is being drawn, but is not able to.
    I changed a lot of code for nothing, that I found out that the problem
is not on the linuxcnc code (this is, all the points are correct), but
rather the GL_TRIANGLE_FAN is not displaying correctly the points. I do
not know way, but I suspect it have something to do with the initial point
of the triangle fan. Unfortunately I do not know so much on opengl. To
prove my statement, I transformed all the TRIANGLE_FAN into lines (using
the same coordinates), and NOW THE TOOL PREVIEW IS DISPLAYED.

    Please take a look into the two images, below, that compares both
situations.

    http://postimg.org/image/qxmnr36ct/d82a4084/
    http://postimg.org/image/y5fge18m1/df9ac6b8/

    Filipe

    Citando Chris Morley <chr...@ho...>:
>> Date: Thu, 9 Jan 2014 08:33:36 +0000
>>    From: fil...@po...
>>    To: emc...@li...
>>    Subject: [Emc-developers] Error in backplot with backtool set up  
>> in lathes
>>
>>    Good morning,
>>      Strangely I did not got any reply from the forum in this question:
>>
>>
>> http://www.linuxcnc.org/index.php/english/forum/21-axis/27365-where-is-the-tool-preview-being-drawn-source-coud#42451[1]
>>
>>      maybe this list can point me in the right direction?
>>      Thank you.
>>
>>
>>    Ligações:
>   look in:
>   /lib/python/glnav.py
>   /lib/python/glcanon.py
>
>   Chris M
>
>    
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