Scene File Documentation-beginner queries

[jeanphi]

Hi,

It's a long time I haven't looked at it, but you might nedd to specify the inverse transform, in this case use 2 instead of -2. Or use a wider angle camera (or even an environment camera) to check what's going on.

Jeanphi

[Sheltem]

Hi,
I just re- read the wiki again and I think I might have found the problem: I had the original matrix used by row rather then by column. I will double check tonight.

Sheltem

[jeanphi]

Hi,

Yes, I've always found the Transform format to be somewhat weird, but it seems to match RiSpec...

Jeanphi

[Sheltem]

Hi,

I think I solved my transform problem
Next thing is support of linked files: If I have the same file multiple times linked into my model ( think of hundreds of semi detached houses) can I use a nested format like this:

Code: Select all

#object containing the entire linked model
ObjectBegin Linked file X

# an object in the linked file
   ObjectBegin object in Linked File x
   ObjectEnd object in Linked File x
   AttributeBegin
      TransformBegin
         Transform [bla bla...]
         ObjectInstance "bla bla.."
      TransformEnd
   AttributeEnd

#end of linked file
ObjectEnd Linked file X
#multiple transforms for each instance of the linked file
AttributeBegin
   TransformBegin
      Transform [bla bla...]
      ObjectInstance "bla bla.."
   TransformEnd
AttributeEnd


I get errors ObjectBegin called inside of instance definition and ObjectEnd called outside of instance definition which seem to indicate that I cant nest objects? Or is there a syntax error somewhere?

Cheers!

Sheltem

[jeanphi]

Hi,

You can't nest ObjectBegin ObjectEnd blocks, those define instantiable objects but don't include the object in the scene, you need to use an ObjectInstance statement for that.
If you don't need instancing, you can create your objects directly in the scene with an AttributeBegin/AttributeEnd block, those can be nested.

Jeanphi

[Sheltem]

Hi,
Thanks for clarifying!

S

[Sheltem]

Hi,
I am having some difficulties:
When working with linked files i need to transform instanced objects twice:
From the locale coordinate system of the object to the world coordinate system of the model
If that linked model got moved in the host file I then need to transform again

If I understand things right in theory all I have to do is to multiply the two 4 x 4 matrices representing each transformation...?
In praxis I end up with problems objects are located all over the shop.

To double check what is going on can I issue multiple transforms like this

Attributebegin
Transformbegin
Transform[....]
Transform[....]
objectinstance....
transformend
Attributeend

Thanks for your patience!

S

[jeanphi]

Hi,

Yes, you can issue multiple Transform statements.

Jeanphi

[Sheltem]

Hi,

Making slow progress... Matrix math almost did my head in
Instancing now works pretty well and the exporter now includes linked files as well...Although it looks like a few items have dropped off in the sample pic below.
(Foreground: host model, 3 other houses is one linked file copied and rotated around a bit)

Linked file test

I will see whether I can fix the last issues with the linked files and will then hopefully move onto implementing a very basic GUI

S

[Abel]

I will see whether I can fix the last issues with the linked files and will then hopefully move onto implementing a very basic GUI

At the risk of repeating myself, it's great to see your progress and perseverance!