[x3d-public] ImageTexture width/height_changed

[Leonard Daly]

Hi Holger,

I am not sure that the actual pixel count matters. X3D always uses 
fractional positioning. The aspect ratio would matter so images would 
not get stretched unnaturally.

Also, I am not sure from your definition how those fields could ever be 
set or events generated. The are listed as initialize only, but the 
'_changed' suffix implies output.

I think a better field (for 2D stuff) is

    SFFloat [out] aspect_changed

or some other suitable field/event name.


The 3D case is trickier because you need to define which axes are being 
used to construct the ratio and you would need at least 2 values.


Leonard Daly


> An ImageTexture loads the texture from file and it is currently not 
> clear for X3D authors if they load the image from unkown origin, for 
> instance from the Internet, or if the url changes dynamically, what 
> width/height the texture has.
>
> I suggest to add two new field:
>
> ImageTexture {
>   ...
>   SFInt32 [] width_changed
>   SFInt32 [] height_changed
> }
>
> This follows the same layout as the AudioClip node has with its 
> duration_changed field.
>
> For completeness also MovieTexture and ImageTexture3D should have 
> these fields.
>
> MovieTexture {
>   ...
>   SFInt32 [] width_changed
>   SFInt32 [] height_changed
> }
>
> ImageTexture3D {
>   ...
>   SFInt32 [] width_changed
>   SFInt32 [] height_changed
>   SFInt32 [] depth_changed
> }
>
> Maybe also ImageCubeMapTexture should have such field, which needs to 
> be defined.
>

-- 
*Leonard Daly*
3D Systems & Cloud Consultant
LA ACM SIGGRAPH Past Chair
President, Daly Realism - /Creating the Future/
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