I have made a lot of mistakes in the last four days and learned valuable lessons about AgiSoft StereoScan, the free program I am using to convert stereo photographs into 3-D meshes. I noticed a problem that when I blended the photos in Photoshop first the floor often melded with the material and StereoScan treated it as a floor plane. Download the 3-D model.
After a lot of trial and error, I found a way to blend multiple photographs and build a 3D model in StereoScan. I ended up manually selecting and deleting everything except the illuminated material in each layer of the sequence. Then StereoScan could map the volumes of the multi-frame packet.
This is the method for converting stereo pairs of photographs into a 3D model:
- Record synchronized stereo photographs.
- Manually delete everything in the frame except the illuminated material.
- Load the blended left and right images into StereoScan
- Create a 3-D model
The models may, of course, be imported with other programs. I used Rhino with V-Ray to make a quick render of one of the simplified surfaces.
Rhino with V-Ray render of original form
Rhino with V-Ray render of rebuilt surface
lasting a very short time; the autumnal blaze of colors is always to be treasured, all the more so because it is so ephemeral
ScanLAB scanned a burned out, decaying chapel and created stunning images.
ScanLAB Abney Park Chapel
Their representation of the building as a ghosted, translucent ghost against the dark background of trees reminds me of how ephemeral models represent time and movement. ScanLAB’s results make the building seem like it is another ghost in the cemetary, a transitory visitory instead of a solid stone building.
ScanLAB are my people. They thought it would be interesting to see if they could scan mist and smoke. Their hunch was right. It is interesting. This is a scan of mist they created.
ScanLAB mist scan
In a way I have been chasing a similar ghost. Ephemeral modeling relies on capturing light as it intersects with a reflective object with a camera. ScanLAB is capturing mist as their laser scan sees it.
AgiSoft StereoScan is a free program that can convert a stereo pair of photographs into a 3D model. I am exploring the technique of photogrammetry in stereo to convert ephemeral models into 3D, digital surfaces. This is the first test. The model may be orbited by clicking and dragging the surface. Download a pdf of the stereo photogrammetry test. The newest version of Acrobat reader is required to view the 3D surface.
“We internalize our experiences as lived situational, multi-sensory images and they are fused with our body experiences. Human memory is embodied, skeletal and muscular in its essence, not merely cerebral.”
Juhani Pallasmaa; Space, Place, Memory, and Imagination; in Spatial Recall; pp. 21
Ephemeral modeling creates two artifacts. One is a bodily, muscular, kinesthetic memory of multi-sensory design lessons learned by experiencing space with occupants. The other is a two dimensional, photographic, blended memory artifact of that bodily experience.
Ephemeral modeling enables architects to transform occupant needs into full scale, interactive, four dimensional experiences and rapidly iterate design ideas.
This photographic tool compresses the duration of a design experience into one glimpse of a space.
This project is eerie and strange and beautiful. Project 12:31 uses images from Texas murderer, Joseph Paul Jernigen, to create these images.
Thanks for sending this Jack.
Throughout this project I have struggled to explain my ideas. This is another attempt to clarify this project, its relevance to the field of architecture and its assumptions.
second review interim report
Alex Kesselarr Running-with-Fire-III
Alex Kesslaar makes fire and light painted photographs. This technique is somewhat related to ephemeral modeling because he is using long exposures and blending them together. Kesslaar’s exposures are longer than the panopticon camera’s exposures so he is able to paint with a small light source. Some of the photographs appear to be blended together because the light breaks in places. The break represents the brief moment when one exposure ends and the next begins. Others appear to be single, long exposures.
Ephemeral models use short exposures that are three seconds apart. The regular cadence of short exposures allows the designer to move materials and model a space. Three seconds is long enough to allow the designer to move into a new position and short enough to allow them to remember where they have been.