formenspiel slides

lesson 5: creating the perspective birds view from a satellite photo

edit ~ 0 kommentare/fragen ~ 28. Apr 2015 16:36

Hello Perspective freaks,

in our next lesson we will bring an object of interest from an orthographic satellite photo to a perspective view.
Best regards
Prof. Andreas Kästner

lesson 4: reconstructing the situation plans from fisheye distorted photography

edit ~ 0 kommentare/fragen ~ 24. Apr 2015 10:59

Hello Persp.&Photo freaks,

here a preview to our next seminar. We will start preparing and analyzing a photo together before each of you will continue with its own material. there is a useful sequence of steps we should follow:

A Preparation of the Photo

1. optimizing the image will improve its contrast ore lighten dark zones
2. remoove distortions by using the lens correction filter (Objektivkorrektur) or alternatively image trends fisheye hemi 3 demo filter which you can download.
3. Use the filter "Konturen finden" (in Stilisierungsfilter) to get a very transparent image where you can determine object edges much better as in the originate photo.
4. Remoove the watermarks of the demo filter if nessecary.

B Analysis of the photos perspective

1. Find the main point MP of the Photo by intersecting its diagonales
2. Search for pairs of parallel object edges and draw them.
3. Start intersecting the longest pair at first to get its vanishing point..
4. Intersect the next pair to get a second vanishing point.
5. To get a vanishing line connect both vanishing points.
6. Draw a line from both vanishing points to the main point.
7. From each vanishing point draw a line perpendicular to one line of step 6.
8. Intersect the last two lines to get the third vanishing point.

C Reconstruction of the orthogonal views (side and ground) of the photographed objects

D Overlay the reconstructed fragments with a larger plan or satellite view to implement other fragments and reconstruct a wider ranged site.

E Generating a 3D model of the whole scenario with the topographical informations (DIM data).

This is very individual and depends on the special situation

best regards
Prof. Andreas Kästner

lesson 3b: construction of a cube in a perspective with 3 vanishing points

edit ~ 0 kommentare/fragen ~ 23. Apr 2015 08:56

Hello perspective friends,

here comes the result of our last lesson as image. I hope all text is readable and there are no mistakes within the protocol.
best regards

Prof. A. Kästner

lesson 3: construction of a cube in a perspective with 3 vanishing points

edit ~ 0 kommentare/fragen ~ 15. Apr 2015 16:40

hello participants of the seminar "Perspective and Photo

here I send you an example for a 3-point- perspective construction. The cubes edge in its left front was free defined. You should imagine the view onto a pyramid with three sides of orthogonal triangles. These three sides are layed down into the same layer as the pyramides bottom triangle. So one can see the perspective construction two side views (only one contains the cube) and the view of the ground from beneath.

Have a look to the view rays which come from horizon to the ground views eye to give the cube a fitting position. One can move the cube back or for, it will then shrink or grow for all cubes points always have to hold their positions on the view rays.

the cubes position in the side view can be found using two circles with VPL as center. Have a look to the view rays in side view that come from the cubes perspective image. The cubes edges that come from VPR are lengthened to the vanishing line between VPL and VPV. From there the view rays start tu the side views eye. They intersect the vertical edges of the cube and show, in which height the bottom and top faces of the cube are.

kind regards
Prof. Andreas Kästner

Reconstructing the plans from a photo with horiz. view

edit ~ 0 kommentare/fragen ~ 15. Apr 2015 16:10

hello perspective heroes,

hier comes the second seminar construction from thuesday, 14. April. I hope you can remember the steps.
kind regards
Prof. Andreas Kästner

Basics in perspective construction

edit ~ 0 kommentare/fragen ~ 14. Apr 2015 10:02

Hello perspective fanatists,

here comes our first seminar from 7. of april. The exercise shows in three projections how the ground view fits to the axonometric view and how both fit to the perspective view. This exercise wants to bring all the specific vocabulary of projective geometry bac in your minds.

kind regards
Prof. Andreas Kästner


edit ~ 0 kommentare/fragen ~ 8. Apr 2015 08:39

Liebe Seminarteilnehmerinnen und -teilnehmer,

hier ein Bildschirmfoto von unserer ersten Konstruktion über den projektiven Zusammenhang von Grundriss, Kavalierperspektive und perspektivem Bild.
Mit freundlichen Grüßen
Prof. Andreas Kästner

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