> 
> Would it be possible to amend the macro so that it somehow visually 
> labelled each edge that was drawn with a number? You could then 
> optionally instruct the macro not to draw certain edges by passing it a 
> list of edges numbers. As well as giving greater control over the 
> render, it could also provide a way of creating "dot to dot" type 
> colouring pictures (see example links below).
> 
> http://www.lego.com/ToyStory/en-us/Downloads/Dot-to-Dot.aspx
> 
> Let me know your thoughts on this.

Hi Reuben,

In short :

- drawing 'dots' in place of 'edges' (which means, for Povray, sphere 
rather than cylinder) is a simple modification to the macro 
EdgeMesh.inc, which I can implement if you want to play with that. Note
that the result you get will depend a lot of the definition of the mesh 
(for a very fine mesh, with lots of vertices/faces/..., the spheres will 
be so close that you won't see the difference with the cylinders; if the 
mesh has fewer vertices, then it might show as a "dot to dot" picture)

- visually labelling the edges seems very difficult (at lest to get a 
decent result), as the numbers involved could easily be large, and also 
the placement of the numbers is by no means easy (3D objects for the 
numbers, or post-process 2d numbers ?, ...) .

-modifying povedge to get, in one click, a "dot by dot" picture with the 
numbers for the dots is also not possible because the edges are not 
ordered along the contours (I mean that, if you follow the silhouette of 
an object, the internal numbering of these edges by povedge can be 
anything, and is not 1,2,3,4... ). So I think that it is possible to 
produce a "dot to dot" picture, by you'll need to add the numbers by 
yourself after rendering the picture in Povray.


Thibaut


PS : I had a quick look at your helicopter model. It seems that there 
are some artefacts in the silhouette contour (which is why, I guess, you 
put the width of this contour to nearly 0, to hide it). These artefacts 
are related to problems with the normals in the model itself (typically, 
if one normal is wrongly oriented with respect to its neighbours, it 
will create one spurious silhouette edge). I tried to mend that on the 
.obj model with Poseray ("calculate normals" in the Groups tab), but 
without success.  How did you create the model, and it there a way to 
check the normal of it before exporting it to .obj format ?




> Reuben
> reu### [at] pearsecouk

Post a reply to this message

Thibaut Jonckheere wrote:

> 
>>
>> Would it be possible to amend the macro so that it somehow visually 
>> labelled each edge that was drawn with a number? You could then 
>> optionally instruct the macro not to draw certain edges by passing it 
>> a list of edges numbers. As well as giving greater control over the 
>> render, it could also provide a way of creating "dot to dot" type 
>> colouring pictures (see example links below).
>>
>> http://www.lego.com/ToyStory/en-us/Downloads/Dot-to-Dot.aspx
>>
>> Let me know your thoughts on this.
> 
> Hi Reuben,
> 
> In short :
> 
> - drawing 'dots' in place of 'edges' (which means, for Povray, sphere 
> rather than cylinder) is a simple modification to the macro 
> EdgeMesh.inc, which I can implement if you want to play with that. Note
> that the result you get will depend a lot of the definition of the mesh 
> (for a very fine mesh, with lots of vertices/faces/..., the spheres will 
> be so close that you won't see the difference with the cylinders; if the 
> mesh has fewer vertices, then it might show as a "dot to dot" picture)

It would be great if you could amend your macro to draw 'dots' in place 
of 'edges'. I could then experiment with different meshes to try and 
create a "dot to dot" image.

Thanks

Reuben

> 
> - visually labelling the edges seems very difficult (at lest to get a 
> decent result), as the numbers involved could easily be large, and also 
> the placement of the numbers is by no means easy (3D objects for the 
> numbers, or post-process 2d numbers ?, ...) .
> 
> -modifying povedge to get, in one click, a "dot by dot" picture with the 
> numbers for the dots is also not possible because the edges are not 
> ordered along the contours (I mean that, if you follow the silhouette of 
> an object, the internal numbering of these edges by povedge can be 
> anything, and is not 1,2,3,4... ). So I think that it is possible to 
> produce a "dot to dot" picture, by you'll need to add the numbers by 
> yourself after rendering the picture in Povray.
> 
> 
> Thibaut
> 
> 
> PS : I had a quick look at your helicopter model. It seems that there 
> are some artefacts in the silhouette contour (which is why, I guess, you 
> put the width of this contour to nearly 0, to hide it). These artefacts 
> are related to problems with the normals in the model itself (typically, 
> if one normal is wrongly oriented with respect to its neighbours, it 
> will create one spurious silhouette edge). I tried to mend that on the 
> .obj model with Poseray ("calculate normals" in the Groups tab), but 
> without success.  How did you create the model, and it there a way to 
> check the normal of it before exporting it to .obj format ?
> 
> 
> 
> 
>> Reuben
>> reu### [at] pearsecouk

Post a reply to this message