Re: gEDA-user: More GL stuff to test

[Bert Timmerman <bert.timmerman@xxxxxxxxx>]

Hi Peter,

FWIW, isometric projection comes to mind, 30/-30 angles and equal Z
coordinates are aligned.

http://en.wikipedia.org/wiki/Isometric_projection

Pros: no more warped boards.

Cons: there are only 8 possible points of view (camera positions)

Keep doing the Good Thing (TM) on pcb+GL  ;)

Kind regards,

Bert Timmerman.


On Thu, 2009-11-05 at 00:35 +0000, Peter Clifton wrote:
> On Wed, 2009-11-04 at 22:05 +0000, Peter TB Brett wrote:
> > On Wednesday 04 November 2009 22:04:09 Christoph Lechner wrote:
> 
> > > Indeed, the board appears like it wasn't a plane. Just take a look at
> > > the right and the left edge of the board ...
> > 
> > Yep, definite projection fail there. It looks like the bottom of the board is 
> > closer, but it's actually further away...
> 
> Anyone know of a better way to do it?
> 
> I was thinking of some kind of pseudo-perspective, like this:
>      ___________ 
>     /           \
>    / __O____O___ \
>   /_/__|____|___\_\
>    /   o    o    \
>   /_______________\
> 
> So the 3D is actually a perspective projection, BUT.. we cheat on the
> Z-coordinate some how, such that all vertical elements (via drills
> etc..) remain parallel on screen.
> 
> All I recall from trying perspective projection, was that it makes
> editing the board at anything other than straight-up orientation very
> awkward.. and even in that case, since the layers still notionally have
> different depths, they render at different sizes, and vias loose their
> parallelism "down" into the page.
> 
>  _____________
> |  _________  |
> | |         | |  (O-o) is a via shown through the board.. with:
> | | Oo   oO | |   O on the top layer,
> | |_________| |   o on the bottom layer.
> |_____________|
> 
> (Ok, fairly exaggerated there, but still).
> 
> 
> That is the issue.. I'm sure there is a way to achieve what I want, but
> my vector maths / GL projection knowledge is a little rusty.
> 
> Until I try this.. I don't know if it will feel any better either, since
> it is also going to be a corruption of what your brain will expect.
> 
> Best wishes,
> 
> Peter C.
> 
> 
> 
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