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Aerial Imagery in LumenRT

Benjamin Pierce
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I am working on a LumenRT model for a medium sized civil project. I have exported my existing surface to a Descartes Scalable Terrain Model and successfully draped an aerial image on it. However, when I export to LumenRT I get weird results. 

If I simply export to LumenRT (normal model) the aerial image on the surface looks terrific, but the civil elements look terrible. Alternatively, when I export to a "large" LumenRT model, I get civil elements that look great, but the aerial image does not come in.

What can i do to make the aerial image look as good in the "large" LumenRT model as it does in the regular LumenRT model?

I am using LumenRT Version 16.01.30.66 and Microstation SS4 Version 08.11.09.832

Thanks,

-Ben

Attachments:

Regular-1.jpg: "Regular" LumenRT Model

Regular-2.jpg: "Regular" LumenRT Model

Large-1.jpg: "Large" LumenRT Model

  • 0 Offline in reply to Mara Manconi
    Mara,

    I am still somewhat confused.

    Why does small model export versus large model export handle the exact same draped image differently? Why is the small model export properly shown with bright colored aerial image pixels but the large model export black? It looks like a software bug.

    Are you suggesting that if I split up a high resolution image into a bunch of smaller image tiles, LumenRT will successfully show the drape at full resolution in either large or small model export?

    -Ben
  • 0 Offline in reply to Mara Manconi
    Hi Mara,

    What's not clear from your explanation is the actual size of the tiles being compared.

    If I had a 1km x 1km draped mesh, with the draped image being 8000pix x 8000pix, are you saying that V8i would resample the single image down to 1000pix x 1000pix - or create 8 tiles of 1000pix x 1000pix each?

    Similarly, would CE more efficiently create two tiles of 4000pix x 4000pix?

    Essentially, which is the best method to create the highest resolution? From your notes it looks like;

    Best = Connect Edition draped mesh
    Next best = V8i mesh draped mesh
    No too good = Descartes STM & Reality mesh.

    Also, what is the purpose of "large model LumenRT export" relative to the standard export? Does it control resolution output, or fidelity of imported geometry?

    Max
  • 0 in reply to Benjamin Pierce
    Hi Benjamin,

    The full resolution aerial images are not taken across from LumenRT. Here is what happens depending on the type of terrain used:

    1. If using a MicroStation Terrain Model, the aerial maps are composited into a 1K x 1K image (V8i) or 4K x 4K image (Microstation Connect Edition)
    2. If using a Descartes STM (this is your case), the images are broken up into 512 x 512 or 1024 x 1024 tiles depending on the resolution of the terrain – moving closer to the terrain with the camera will generate larger image tiles.
    3. If using a RealityMesh for the terrain, these are tiled at 512 x 512

    I hope this explains

    regards
    Mara
  • 0 Offline in reply to Mara Manconi

    Mara,

    All of the information, both in the original file and references, is only 155 MB total. I have uploaded a zip file containing the original file (Modeling_BAP.dgn), the image draped surface (pa0206_NoVoids_Descartes.dgn) and some other ancillary references to the Bentley secure upload system. Let me know if you need anything else.

    Thanks,

    Benjamin

  • 0 in reply to Benjamin Pierce
    Hi Benjamin,

    sorry I wasn't clear, I mean the whole dgn file, before export to LumenRT Connect Edition Up 1.
    Because there is a know defect regarding files greater than 2GB .

    if it is not the case, please sent us the file in order to test in our environment

    regards
    Mara
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