DigiCad 3D

What is DigiCad 3D Used For?

What is DigiCad 3D Used For?

Elimination of perspective distortion Mosaics of pictures and drawings Optical deformation correction Correction of scanned drawings and maps Georeferencing of maps Digitizing of photos, scanned drawings and maps Textures from photos Connection with large size digitizers Measurement of various geometrical data on pictures and drawings Regular- or irregularly curved surfaces can be straightened out Photographic plans can be created, based on mathematical digital terrain models Drawings and pictures can be straightened, or corrected, by snapping them to a series of attach points that correspond to real measurements taken on site, producing perfectly-scaled elevation. DigiCad 3D can also be used for mapping, to snap together pieces of site maps at the correct scale or digitize aerial photos. This makes it useful to architects, engineers, or anyone involved in building surveys or site analysis.

DigiCad 3D’s Dynamic Attachment Feature

DigiCad 3D's Dynamic Attachment Feature

Dynamic Attachment feature allows you to view both the digitized drawing and the straightened drawing on screen at the same time. This means that if you're digitizing a photo of a building facade, for example, you can view the straightened elevation while you work. The feature is dynamic because the corrected elevation is updated in real time as you draw. You can also move the attach points and see the result immediately. This gives you total control while you work and more flexibility. The Dynamic Attachment feature is also used to transform pictures and to eliminate perspective distortion.

How to eliminate perspective distortion from a building photo

How to eliminate perspective distortion from a building photo

Follow the step bellows:
  • Import a photo
  • Set scale and unit of measure
  • Set the four origin attach points on the photo. The bottom-left point first, the top-left point second, after the top-right and the bottom-right. The Attach points are represented with red markers on the screen.
  • Open the Destination Attach points dialog from the Trasnfrom menu
  • Insert the real coordinates correspondent to the Destination Attach points. The reference system isn't important, it's sufficient that all the coordinates are in the same reference system (ex. the left corner of the building and the ground line). The Destination Attach points are represented with blue markers on the screen.
  • Select the picture
  • Choose Transform Picture from the Transform menu
  • Choose resolution, number of colors and Opaque or Transparent option
  • Click the Ok button
The process requires some time, depending on the picture size, the scale, the resolution and the size of the transformed picture. The message box shows the progress of the process

Is it possible to eliminate perspective distortion from a photo without any measured point?

Is it possible to eliminate perspective distortion from a photo without any measured point?

Yes, it is. This is when you do not have the precise measurements necessary for an exact operation – you have perhaps a few horizontal/vertical indications, which can help reconstruct an approximate situation. In this case, draw on the photo the lines you believe to be horizontal and vertical, put the 4 attach points on the photo and make a rough drawing of lines and attach points. Move the destination attach points until the horizontal and vertical lines are correctly aligned. When you have got the drawing right, you can transform the image. Another method is to draw a rectangle with the approximate final size of the drawing. Set graphically the Destination Attach points on the vertices of the rectangle and the Origin points on the corresponding points on the photo.

How DigiCad 3D’s Attach Functions from files Work

How DigiCad 3D's Attach Functions from files Work

igiCad 3D has various Attach functions, from the File menu, that allow you to "snap together" different drawings by designating a certain number of corresponding Attach Points. A two point attachment is the simplest and allows you to connect two drawings by designating an origin point and reference point (two Attach Points). When the two drawings are attached, or "snapped" together, they are automatically scaled, fitting one drawing to the other. Four and five point attachments are used for maps and architectural surveys using photographs. In the latter case, you can obtain a perfectly scaled elevation using one or more photos of the building face. The common denominator in each of these cases is the use of two documents (the source document - a digitized photo, for example - and the resulting scaled document). For the survey of an architectural facade, the work phases would be as follows: - import the image (drawing or photo) - designate at least 4 Attach Points - digitize all the necessary parts of the image (maybe certain sections aren't needed) - save the work - open a new document - insert the 4 corresponding Attach Points with their real measurements (the four corners of a window, for example, or the four corners of the facade - it depends on the scale of the detail wanted) - Attach the previously saved document using the Attach command. With the new Dynamic Attach feature you can do the same thing using just one document instead of two, controlling the work dynamically and reducing your work time. With the new procedure, the steps are as follows: - import the image - designate the 4 Origin Attach Points and insert their corresponding real measurements in the Dinamic Attach Points - digitize the image and/or transform the picture or parts of the picture. Using this procedure you can view the image you're digitizing AND the corresponding corrected elevation image at the same time, allowing any errors to be corrected immediately. If you move the Attach Points, everything is simultaneously scaled accordingly. The Dynamic Attach procedure doesn't mean, however, that the old "static" procedure is obsolete. In more complex cases where several photos are used (some general, others of details), it is more convenient to work on several separate documents, then snap them all together afterward.

GeoTec B

In the case of a dam, what is the best way to consider the hydraulic pressure on the upstream face?

In the case of a dam, what is the best way to consider the hydraulic pressure on the upstream face?

Do you use a water bed which is above the ground surface (will this then compute the hydraulic load on the upstream face?) or do you use a trapezoidal load to represent the water?

It is possible to use two different methods depending on the result wanted.

First case:

We have a dam with water on one side (let's suppose on the right side). We want to verify the dam from right to left.

Dam1

The best method is to consider a water stratum. A water stratum has 0 porosity, O cohesion coefficient, 0 Fi and 0 weight.

The water bed is on the top of this stratum.

The slide surfaces must continue inside the "water stratum" until the surface.

In this case Geo-Tec B considers the weight and the pressure of the water bed correctly.

Second case:

We have a slope in the water as on a lakeshore or seaside.

Dam2

We want to verify the stability of the slope immerged in the water.

In this case it isn't possible to apply the first method and it's necessary to consider the water as a triangular or trapezzoidal load on the terrain (to consider the effect of the water on the terrain surface) plus the water bed (to consider the effect of the pressure of the water inside the terrain).

There is a special case to simulate a quick emptying of a lake. It's possible to simulate this case deleting the loads on the surfaces and maintaining the water bed on the top level. This because some time is needed for the water inside of the terrain to come out and in the meantime the internal pressure of the water corresponds to the top level of the water bed.

Nonio C

How does grahic import work in Nonio C?

How does grahic import work in Nonio C? Nonio C imports graphic images in several formats. The PICT import command uses QuickTime and can import all the graphic formats handled by the installed QuickTime Other methods to import an image in Nonio C are Copy and Past and Drag & Drop.

How does DXF import work in Nonio C?

How does DXF import work in Nonio C? Nonio C imports single points,  polygons (in DXF Polyline), faces, which it inserts as points to eventually be united by breaklines. It does not import other elements, such as lines, text, circles, etc. The primary use of DXF importation in Nonio C is to import contour lines from maps and complete 3D models. If you want to import a drawing for other purposes (such as to serve as the base document for a survey project), it's better to import the document first to another program, for example DigiCad 3D, then to Nonio C using Copy and Paste or Drag and Drop.

How can imported images be used?

How can imported images be used? Imported immages can be used for a number of objectives, among which some are listed below: - Digitalization of a map with contour lines - Superimposing a design on the survey - Superimposing a survey drawing on an aerial photo - Use of a design as a guide for infill or excavation - Comparison of the terrain model with the map - Comparison of the terrain model with map of property lines

How does Nonio C calculates the terrain model?

How does Nonio C calculates the terrain model? Nonio C constructs a mathematical surface connecting points with line segments to construct triangles. The generation of triangles is also regulated by the maximum distance for triangulation entered in the Preferences dialog box, which requires the program to search for and construct triangles only among points falling between the set distance. For any number of points, there are several possibile ways in which they may be joined by triangulation. If the general guidelines given above are followed and a reasonable maximum distance for triangulation set, the generated model should represent closely the actual terrain conditions. When there are certain discontinuities in the surface, a more detailed modeling process is required. In these situations, connections can be somewhat ambiguous, even for a simple case involving only four points. If automatic triangulation is used in situations like the one above, it can cause erratic results. Nonio C offers the user the ability to impose breaklines (representing lines of discontinuity, such as ditches, ridges, or streets) from which the triangulation can then be completed automatically. The user can locally correct the automatic triangulation and Nonio C recalculate the modified model immediately and automatically.

Domus Cad

Lopsided wall

I want my wall to be 100 cm wide at the base, narrowing to 80 cm at the top. It is 150 cm high. How can I draw this lopsided wall? Draw one 80 cm wall and one 20 cm wall. Change the height of one side of the 20 cm wall to 0 (you obtain a triangular wall). Move the 20 cm triangular wall close to one side of the 80 cm rectangular wall.

How to insert library objects

I have difficulty with putting furniture in my drawings. When I choose a piece of furniture, it appears in the bottom left of my screen in a "fade" Grey color. I then move it to the place I want it, but once I click on it, it disappears. The same happens with windows also.  You have to press the space bar or the Return key to fix a library object on the drawing. When you import the object you can see it grayed in the bottom left corner of the window. Drag it where you want and press the space bar or the return key. By dragging with the mouse and pressing again the Return key, you can insert several copies of the same object.

Grids, scale and measurement

I would like to know how to draw a grid and something about scale and measures in general. Double click on the Grid icon on the right of the working window. Set the grid values for X and Y directions. This is the active grid. If the icon is enabled (pressed), the mouse is attached to the grid while you are drawing. The active grid can be visible or not. The visible grid is drawn on the screen, but if it is too small, Domus.Cad displays a multiple of the grid. In this case the grid lines are different. You can test this activating the grid and zooming in and out. If both the Snap to Grid and the Snap to Hot Points are activated, the cursor first attaches to the points, intersection, perpendicular, center, border etc,, then if it doesn't find anything, attaches to the grid. We suggest leaving the grid active by default. Look at the coordinates and distances boxes on the Coordinates palette. When you click on any point of the window, the relative and polar coordinates are zeroed on this point. Moving the mouse, the relative and polar coordinates refer to the last point clicked. You can visualize the last point clicked at any time by pressing the W key. In Domus.Cad you use real measures and you can choose the unit of measure and decimals. Anyway the Window title shows the current video scale and you can set a reference scale, called Natural scale. An icon on the bottom of the working window allows you to see the drawing with the Natural scale. The Natural scale is important for font size. When you choose a text size, it means that the text will be printed with that size if the printing scale is the same as the Natural Scale, otherwise the text will print out bigger or smaller.

Questions regarding the use of 3D View

Why does a light inserted in one room illuminate the adjacent rooms as well?

Shadows are not an available option for Interactive rendering, therefore the elements themselves (such as walls and floor slabs) are merely shaded according to their relationship to the light source and do not have the ability to cast shadows on other objects, making it seem as if the light passes through them. It is not possible, for example, to create a completely dark room, even if it has no doors or windows. Use OpenGl and Rayshade renderers for casting shadows.

What purpose does ambient light serve?

Ambient light's primary purpose is to lighten the shaded areas. Without ambient light, all shaded areas would be completely black. A lack of ambient light creates a greatly contrasting image, while a predominance of ambient light creates an image with little contrast. Another purpose is to create a certain atmosphere by changing the ambient light's color.

How do you print the 3D view?

The easiest way is to transfer the view to an unused layer and page it using the normal DomusCad procedure, after which it can be printed.

Is it possible to make a QuickTime film from the 3D view?

It is not possible to make a QuickTime film from inside Domus.Cad, but it can be done using other programs, such as Snapz Pro and Screenium, it is possible to film everything from the 3D View window.

When paging, Domus.Cad opens the layer too far to the right of my screen and too far down

When paging, Domus.Cad opens the layer too far to the right of my screen and too far down. Every time I have to move the layer over to the left, so that I can click on the bottom right corner and reduce the layer size. And then I move it back to the right again! In order for the page to correspond exactly to the printer page, do the following:  - Go to pagination - Click on Page Setup button and choose your page dimensions, orientation and page scale in the Page Format dialog window - Click on Drawing Size button and cli

Garret wall that is void below the lower roof

How do I create a Garret wall that is void below the lower roof and solid above the roof line? Select the wall and the roof and execute the command Adjust Walls on Roof from the Process menu.

Columns

Any tips you might have on making a Column would be helpful! If the section of a column is a rectangle, treat it as a simple wall with the desired dimensions. For a circular column, you can use circular slabs as in the example below - let’s suppose that we want a circular column with a height of 3 meters. Double click on the Floor/Slab icon and set Slab thickness and Ref. Ht. as below. Double click on the Circle/Polygon parameters and click on Slab Generation With the Slab Generation option enabled, every time you draw a 2D shape like a circle, ellipses, regular or irregular polygons or a freehand curve, you are inserting a slab with the current characteristics. If you draw circles as below, you obtain circular columns as in the 3D view. For more complex columns, you can use the SuperRot module from the Modules menu as follows: - Draw half a column with a 2D polygon starting from the origin of the axes. - Select it and choose the SuperRot module. - Set the SuperRot parameters as below and click on OK. You will see the column in plan. Drag it where you want - place and accept it by clicking on the Space bar or the Enter key. The result in plan and in the 3D view are as below.

Metric Calculation problem

Why does the Metric Calculation command bring up a a blank page? You probably haven't assigned a calculation mode to your elements. Select the elements and choose Calculation from the Parameters menu. For example, you can choose to calculate the volume of a Wall, or the surface area of one face, two faces, or all faces.

People or animals in 3D view

How can I create people, animals, etc. in a 3D view ? You can either create 3D models (quite complicated), import a 3D model in DWG, DXF and 3DS formats or insert the images people or animals into the 3D view. For example:

  • create a 3D view and place it on a free layer
  • import the image into DomusCad (e.g. using Cut and Paste).
  • Draw a polygon on the image around the part of the photo to be cut. Use PictRot to extract the internal part and set white part transparent.
  • rescale the image if necessary, to the same scale as the photo

Green reference cross in paging

When paging, the green reference cross shows, will that be printed - and if so how can I prevent it being printed? The green reference cross isn't printed. It's useful to show the position corresponding to the coordinates on the top of the windows and to easier align different layers.

See all the Domus.Cad FAQ