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

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