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Colour use
October 10, 2012 05:06PM
This is a repost of something I just put up on Flickr. Hopefully this image works; if not, the link to Brickshelf should at least be active...



Here is something that has been bugging me for ages, and I was wondering if anyone could shed some light on it.

These images show the POV-Ray output for various rendering conditions. Three colour definitions are used - MLCAD standard, LGEO and Koyan's list. For the standard MLCAD colours, POV-Ray checks the list of pre-defined colours (I am assuming this – please correct me if wrong) and uses those, leaving everything else as “color 7” (lt grey). For example, the reddish brown and lt flesh plates are both lt grey, as these are newer colours and not on the standard list. For the modified “solid” and “24-bit” colours, POV-Ray defines each colour itself, rather than referring to a list, so every colour is included. The down side is that they do not look very realistic in POV-Ray, with the exception of the 24 bit colours (I have been using these recently).

When using LGEO, POV-Ray first checks each colour against LGEO's list and then defines that colour if it is not there. However, having done this, it goes on to associate “color 7” with those parts which have colours not on the MLCAD standard list, even though new definitions are available. Again, this can be seen for the reddish brown and lt flesh plates. The same thing happens if you use the “koyancolours” file – apparently all it does is redefine the colours on the standard list, even though it includes many more. Adding new colours to the list does not work, but reassociating existing colours to ones that are not working (e.g. changing a bizzare purple to lt flesh and calling the bizzare purple colour code) does work – the lt flesh plate is now the right colour. Now for the weird bit – if you go into the POV-Ray file and change the remaining “color 7” tags (Koyan added reddish brown to his list, so this plate is no longer an issue) to colours on the koyancolours list, which were the originally intended ones, they come out fine. The case here is the lt and dk bley, colours 71 and 72 – these do not work in standard MLCAD, LGEO or unmodified POV files for koyancolours.

In short, does anyone know why on earth this is happening, or is this a more general concern for how MLCAD does its thing?

Many thanks,

Chris

Edited 1 time(s). Last edit at 2012-10-11 12:19AM by Chris Beckett.
SubjectAuthorViewsPosted
Colour use Chris Beckett1175October 10, 2012 05:06PM
Re: Colour use Philippe Hurbain402October 11, 2012 12:07AM
Re: Colour use Chris Beckett408October 11, 2012 12:24AM
Re: Colour use Philippe Hurbain423October 11, 2012 02:11AM
Re: Colour use Travis Cobbs383October 11, 2012 09:48AM
Re: Colour use Chris Beckett372October 11, 2012 06:26PM
Re: Colour use Chris Beckett361October 12, 2012 08:00PM
Re: Colour use Steffen365October 13, 2012 03:37AM
Re: Colour use Chris Beckett375October 14, 2012 06:52PM
Re: Colour use Travis Cobbs338October 15, 2012 01:27PM
Re: Colour use Chris Beckett333October 16, 2012 12:59AM
Re: Colour use Chris Beckett378October 19, 2012 07:20AM
Re: Colour use Travis Cobbs327October 22, 2012 09:59AM
Re: Colour use Chris Beckett327October 22, 2012 05:28PM
Re: Colour use Philippe Hurbain354October 22, 2012 11:59PM
Re: Colour use Attachments Chris Beckett4484October 23, 2012 01:18AM
Re: Colour use Chris Beckett278December 02, 2012 10:03PM
Re: Colour use Attachments Chris Beckett579December 08, 2012 08:38PM
Re: Colour use Max Martin Richter367October 11, 2012 12:28PM



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