DigiCad 3D

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 The Dynamic Attach procedure doesn't mean, however, that the old "static" procedure is obsolete.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.

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.

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.


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.


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

Modifying windows in walls

Does the package allow the insertion of windows and doors accurately using coordinates, as for walls? Yes, there are several methods to accurately insert or modify an opening, window or door, in a wall. Double click on the Windows/Doors icon and look at the Windows or Doors parameters dialog window: You can choose several tracing modes. Example:  I want to insert a door of 150 cm starting 60 cm from the corner of the room. In this case I choose the (b+c) Fixed Width+Dist. option and set the fixed distance = 60 cm and the Fixed length = 150 and press OK. Click inside a wall - the program finds the closest corner or end of the wall and places the opening correctly. (Move the mouse around to find the internal part of the wall, marked with a bullet.) In the same way you can modify the position and length of one or more selected windows/doors. Or, you can insert openings using the polar absolute and relative coordinates of the coordinates palette. The absolute coordinates are referenced to a global or local origin that you can place in any point, so it is a good idea to place elements with progressive distances.

Modifying wall parameters

I am trying to change the parameters of a few walls already in the design, and each time I open the "Walls..." dialog box and make some changes, I get an error message. I selected the walls I wanted to alter and then selected "Walls..." from the Parameters menu. Do you have a Window or Door in the wall? In this case you must select the walls on both sides of the Door or Windows. Another problem can happen if you try to insert measures in fractional inches and feet without setting this unit of measure first.

Does new element go over or under?

Each new element I draw goes under, instead of over, existing elements and there is no way to move it up. Please help! In Domus.Cad different elements are ordered as followed: - Pictures - Polygons and curves - Slabs and roofs - Stairs - Walls - Objects So a wall will always be on top of a polygon, even if the polygon is inserted after it. The Send backward-forward functions work on elements of the same group. How to change this order? Simply group bottom elements in an object and the new object will be drawn on top of everything.

Sun blinds

How can I draw trapezial sun blinds ? If your blinds are vertical, you can use the Slab elements. Simply draw a slab with the section of one element of the blinds. After, duplicate the element with the right offset.

Using layers to organise views

Also when I have the vault layered over the plan, can't see the internal layout - its like the vault is solid - how can I make the vault look transparent or outlined while I work on the other parts of the design. There a couple of ways: 1) put the vaults and any other elements that might interfere on a separate layer and simply deactivate the layer in the Layer Parameters and/or Technical & 3D View Parameters. As a general rule it's better to use lots of different layers (and materials). Put all like elements and design levels (floors, walls, garret walls, roofs, etc) on separate layers. It's much easier to control visualization, make selections, and modify elements. 2) Separate the vault object, select all the individual slab elements, and deactivate the borders and surfaces in the Slab Parameters. Remember though to activate "All Slabs" in the Technical & 3D View Parameters or the slabs won't show at all!

Does DomusCAD have an SDK ?

We are working on graphical programming where special graphic elements influence the way the program works, like the very useful Apply Object and the ##APP elements. Domus.Cad has a c++ developer API that allows you to develop plug-ins. Any plug-in in the Modules folder is automatically recognized by the program.

Window in gable wall

How do you put a window into a gable wall? I have split the wall into two, coinciding with the apex of the gable in order to create the varying wall heights. But I now am unable to create a window across the center of the gable, bridging between the two walls. Is there a better way to do this? The window must go into a wall, so I suggest the following: - Divide the gable wall in three parts - Put the Window into the middle wall - Create two more walls on top of the middle wall. It's better to build the upper walls separately, group them in a object and put the object on top of the central wall - you can't start or end walls in the middle of a window or door. The frontal view is as follows:

Lengthening a wall

When lengthening a Wall , the program calculates from the center of the wall, even if the start point indicated was the end of the wall. A wall is registered by its axis and this is what the program takes into account, during modifications. If you want to maintain the original direction, choose the option Only Axial Deformation, or press the Shift k

Parametric selection and the AREF code.

Would you mind explaining a bit more about this parametric selection and the AREF code. AREF means Architectural Exchange Format. It's a file format that allows the communication between Domus.Cad and other engineering software. AREF code is a name that we can give to any element to identify it in other softwares or in Domus.Cad. We can use it to name elements, to group them and retrieve them quickly by the Parametric Selection. Parametric Selection allows to select or de-select elements depending on their characteristics (color, element type, fill, set etc). Let suppose that you want to select all the walls of the drawing excluding the red walls. You can select all the walls usually with a selection rectangle and after, with the Parametric Selection command, you can take off all the red walls. AREF code, Set and Category add three not graphic information data to the drawing and you can use this information for a more quick, flexible and productive use of Parametric Selection.


I would like to add texture to a 3D perspective, but when I "paste" a fill to the floor, it is visible only in 2D. In the 3D view you can use photorealistic textures. Go to the Colors parameters, associate a texture to a color, activate the texture check box on the color parameters dialog and on the 3D view (far right button).

See all the Domus.Cad FAQ