Collada importer improperly handles non-specular materials #38343

Closed
opened 2014-01-23 22:55:47 +01:00 by Zauber Paracelsus · 4 comments

System Information
64bit Linux Mint 16, kernel version 3.11.0
GeForce GTX 650 Ti, driver version 419.32

Blender Version
Broken: 2.69.0

Short description of error
When importing a Collada file, any materials that do not specify specular shading will have their specular set to the default. This appears to be incorrect, as a material should only have specular if it is specified. Because of this, collada files exported from blender that have no specular will have the default specular when re-imported. I have no idea if this behavior violates the collada standards, though I am assuming that it does violate the standard as it seems illogical.

Exact steps for others to reproduce the error

  1. Create a new object and create a new material for it
  2. Set the Specular Intensity to 0
  3. Export the scene to a Collada file.
  4. CTRL-N to start a new file.
  5. Import the Collada file you just exported
  6. The Specular Intensity will again be at 0.5
**System Information** 64bit Linux Mint 16, kernel version 3.11.0 GeForce GTX 650 Ti, driver version 419.32 **Blender Version** Broken: 2.69.0 **Short description of error** When importing a Collada file, any materials that do not specify specular shading will have their specular set to the default. This appears to be incorrect, as a material should only have specular if it is specified. Because of this, collada files exported from blender that have no specular will have the default specular when re-imported. I have no idea if this behavior violates the collada standards, though I am assuming that it does violate the standard as it seems illogical. **Exact steps for others to reproduce the error** 1) Create a new object and create a new material for it 2) Set the Specular Intensity to 0 3) Export the scene to a Collada file. 4) CTRL-N to start a new file. 5) Import the Collada file you just exported 6) The Specular Intensity will again be at 0.5

Changed status to: 'Open'

Changed status to: 'Open'

Added subscriber: @ZauberParacelsus

Added subscriber: @ZauberParacelsus

Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'
Brecht Van Lommel self-assigned this 2014-01-24 16:51:09 +01:00

I've added it to the list of Collada bugs here:
http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Import_Export

There's many issues in the importer and we don't have the resources to fix them at the moment. Looking at this material code it can use a rewrite, the way these collada parameters are mapped onto Blender materials doesn't make much sense to me.

I've added it to the list of Collada bugs here: http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Import_Export There's many issues in the importer and we don't have the resources to fix them at the moment. Looking at this material code it can use a rewrite, the way these collada parameters are mapped onto Blender materials doesn't make much sense to me.
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Reference: blender/blender#38343
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