The holmos and lebes digitally restored

28 Nov

The bronze holmos of the Regolini-Galassi tomb is a very elaborated and beautiful object that has suffered significant damage and corrosion.

bronze holmos

Bronze holmos from the Regolini-Galassi tomb (photo: Vatican Museums)

To reveal the beauty of this object, we have unwrapped its decoration and used this image to create the line drawing of the engraved decoration.  Based upon this engraving and upon detailed study of the applied embossing, we have created a displacement map of the decoration of each of the parts of the holmos.

holmos unwrapped texture

Unwrapped decoration of the holmos cone (image: Visual Dimension bvba)

The displacement map is created in the same way as for the other objects: we simulate the engraving and embossing process in different layers of a Photoshop image, that is overlaid on the unwrapped texture.

Depth map holmos cone

Displacement map of the holmos cone (image: Visual Dimension bvba)

The displacement map is transformed into a normal map in Unity3D, giving a very nice real time rendering of the bronze object.

DROMOS8_new

Digitally restored holmos, placed in the Regolini-Galassi tomb (image: CNR-ITABC)

Digitally restored holmos, placed in the Regolini-Galassi tomb (image: CNR-ITABC)

DROMOS10_new

Digitally restored holmos, placed in the Regolini-Galassi tomb (image: CNR-ITABC)

The 6-headed lebes also suffered deformation and damage, so we performed digital restoration on this object as well.

6-headed lebes

Bronze six-headed lebes from the Regolini-Galassi tomb (photo:Vatican Museums)

In this case, we derived the unwrapped texture from a 3D model that was made from dense stereo matching on a set of photographs taken with an object tent.

3D photography of the lebes

Photography of the lebes in an object tent for creating the 3D model (photo: Vatican Museums)

detail of lebes

Detail of the engraving of the lebes (photo: Vatican Museums)

We first identified the full engraving of the lebes on the unwrapped texture, completing the missing parts.  Then, we painted the embossed features in a similar way as the other objects, through observation of those features on the many photographs taken.

lebes_depth_map_comp

Displacement map superimposed upon the unwrapped texture of the lebes (image: Visual Dimension bvba)

The displacement map was imported in Unity3D and translated into a normal map for real time visualisation (see images below, compare with images above).  All digitally restored objects are integrated in the new version of the application.

digitally restored six-headed lebes

Digitally restored six-headed lebes (image:CNR-ITABC)

Digitally restored six-headed lebes

Digitally restored six-headed lebes (image:CNR-ITABC)

This blog is part of the Etruscanning 3D project, that is being partially funded with support from the European Commission. This blog reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.

 

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2 Responses to “The holmos and lebes digitally restored”

Trackbacks/Pingbacks

  1. Did griffins really exist? « Virtual reconstruction of Regolini-Galassi tomb - January 28, 2013

    […] of the head.  Other depictions of griffins on objects from the Regolini-Galassi tomb, such as the holmos, are very similar and show the same characteristic […]

  2. Etruscanning3D in Tongeren | Virtual reconstruction of Regolini-Galassi tomb - March 18, 2013

    […] In a separate room, the contour of Regolini-Galassi tomb has been depicted on the floor and some of the objects from the tomb are on display, positioned on the same place as in the original tomb. Key objects which are on display are the six-headed lebes and the bronze holmos. […]

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