Re: Question on transparent camera transformed objects.

[Frank C. <dev...@ch...>]

On 28-Sep-04, at 1:52 PM, James W. Walker wrote:

> Peter Michelsen <Pet...@mi...> wrote:
>
>> I tried this but it had no effect as the objects are
>> transparent..... and I guess ( from testing ) use the last style
>> illumination style set in the submit loop. ( does this sound right
>> or am I way of base? ).
>
> That seems right.  Quesa saves the illumination style with each  
> transparent primitive, but only uses it to decide whether to use  
> specular highlights.  That is, it distinguishes Phong and Lambert  
> illumination from each other, but does not consider NULL illumination.  
>  This should probably be filed as a bug, if it hasn't been already.

I pointed this bug report out earlier in the thread:

[ 967773 ] Lighting state isn't respected on transparent objects
<http://sourceforge.net/tracker/index.php? 
func=detail&aid=967773&group_id=45158&atid=442052>

Simple fix really, but some other states can be merged into a state  
cache as well, like fog, orientation, and fill - setting those for each  
polygon is a waste. I can put together a fix but was kinda waiting to  
see an update to IRTransparent.c first, since the sorting code has  
proven to been unusable for my purposes.

James: Has there been any progress with your new sorting algorithms? I  
would very much like to see your fast centroid method checked in.

There are also some related fixes that would help bring the  
transparency renderer up to snuff:
<http://sourceforge.net/tracker/index.php? 
func=detail&aid=973022&group_id=45158&atid=442052>
<http://sourceforge.net/tracker/index.php? 
func=detail&aid=967958&group_id=45158&atid=442052>

Frank.