[x3d-public] IndexedTriangleSet defaults

[Roy Walmsley]

Hi Andreas,

 

Initially I was surprised by your comment below. As you say, the default value of the texCoord field is NULL for the IndexedTriangleSet node. But when I looked at the IndexedFaceSet node, I found that it too has a default value of NULL for the texCoord field (see http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/geometry3D.html#IndexedFaceSet). So both are in agreement there.

 

However, I assume you are referring to the text in the penultimate paragraph for the IndexedFaceSet, which commences “If the texCoord field is NULL, ….”. Here an implementation behaviour is detailed for when the default value is NULL. In comparison, the IndexedTriangleSet node has no such behaviour defined.

 

I don’t know why the two instances are different. It is an interesting observation., which is also worthy of a specification comment.

 

Regards,

 

Roy

 

From: x3d-public [mailto:x3d-public-bounces at web3d.org] On Behalf Of Andreas Plesch
Sent: 11 April 2016 14:34
To: X3D Graphics public mailing list
Subject: [x3d-public] IndexedTriangleSet defaults

 

For IndexedTriangleSet the default value for texCoord is NULL.

http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/rendering.html#IndexedTriangleSet

On the other hand the texCoord default value for IndexedFaceSet is a reasonable map which tries to fit a texture on the mesh.

Is there a reason for this divergence ?

Andreas

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