Parts of my Model disappear when adding Material

[Dean Connolly]

This has only just started happening, I created some legs for a chair about 3 days ago and added a Chrome texture. Now when i go to change the material parts of the model disappear?

I'm on Autocad Architecture 2013. 

[Roy Hirshkowitz]

It's possible they're being drawn in the color of the background, based on the AutoCAD material.  See if you can select them anyway.

You have a few things to try-- you can change the AutoCAD material in its editor after you're done editing the nXt one (editing the nXt one will cause the AutoCAD material to revert).  Alternatively you can use a different display mode.  If you can't figure it out, upload or attach a simplified model showing the problem and I'll take a look.

[Roy Hirshkowitz]

Haven't seen this before.  Is it reproducible?  If so, I'm very interested in the drawing.  Upload it if you can.

marco prina said:

like this one? it happens to me too, Acad 2008 32bit. if you zoom the first chair, you can see one wheel and some steel disappear (are not renedered)

[Roy Hirshkowitz]

Only use it if it's repeatable.  Include instructions for how to repeat it.

[Dean Connolly]

Yes just like that when i render, but also looks like this in model view in Autocad, so it doesn't just show up when rendering its there in the model if that makes sense?
 
marco prina said:

like this one? it happens to me too, Acad 2008 32bit. if you zoom the first chair, you can see one wheel and some steel disappear (are not renedered)

[Roy Hirshkowitz]

Send an example-- make it as simple as possible-- include any necessary instructions.

Dean Connolly said:

Yes just like that when i render, but also looks like this in model view in Autocad, so it doesn't just show up when rendering its there in the model if that makes sense?
 

[Dean Connolly]

Hi Roy - I have emailed the file its 7mb so can't upload.

Just try to add a material and you'll see what i mean.
 
Roy Hirshkowitz said:

Send an example-- make it as simple as possible-- include any necessary instructions.

Dean Connolly said:

Yes just like that when i render, but also looks like this in model view in Autocad, so it doesn't just show up when rendering its there in the model if that makes sense?
 

[Roy Hirshkowitz]

Add a material?  Do you mean create a new material, attach a new material to an object, attach a new material to a layer?  Try to be more specific.  (I've got the drawing, BTW.)

[akinlolu olugboji]

All these I believe has to do with the display, either your graphic card or AutoCad, not sure which is. When this happens I simply save, end the autocad session and re-launch it again, and all display well.

[Dean Connolly]

Sorry Roy, attach a new material to an object.

Roy Hirshkowitz said:

Add a material?  Do you mean create a new material, attach a new material to an object, attach a new material to a layer?  Try to be more specific.  (I've got the drawing, BTW.)

[Roy Hirshkowitz]

What you sent me is a badly mangled AutoCAD 3d solid vaguely resembling chair legs.  Is this what you intended?  Adding a material to the drawing, assigning a material to the object, editing an existing material had no effect on the solid.  No clue how it got that way.  If you need me to debug something that you suspect is related to nXt-- I'll need to see an un-mangled version and a procedure for mangling it.  

nXt doesn't alter geometry, at least not that I'm aware of.  It's much more likely this type of error is due to something else.  It is remotely possible that working in 32 bit caused a low memory situation which caused the model to fail somehow.

[Roy Hirshkowitz]

Marco-- I couldn't reproduce your problem.  Everything rendered fine here.  Just for fun, here's a version of your model done in the Standalone nXt I'm working on.  Daylight only, with the sun settings restored to default.

[Roy Hirshkowitz]

In many cases you can usually just use the presets.  Combining interior daylight and lighting is explained here.

In your case, since you changed the Sun Intensity to a very low number, I just set that back to 1.0 to restore the direct sunlight.  I left your Cloudiness setting at 0.3.  The engine for the standalone version is e4.  I added reflective caustics to the mirrors so they would reflect some of the daylight back onto the walls and floors-- though I'm not sure this made a big difference.