60001812 Get area 3d visibility for solid surfaces from a specific view

Summary

I want to get all the visible areas of 3d Surfaces from a specific view.

Solution

In version 6025 we exported a new method to the Document class.

If you have a drawing of a house you can obtain the visible area of the house from different views (for example for wind calculations).
vdPolyhatch , vd3dFace and solid hatched curves are being calculated.

summary>Get the visible area of passed entities at the specified view direction
param name="entities">A collection of vdFigures for which the visible area will be calculated.
param name="VisibleDirection">Visible view direction of clip view plane in World Coordinate System(WCS).
param name="SquareRectSize">Defines the size of small square in Drawing units that each surface is divided. Smaller values gets more time to calculate.
returns>A collection of object type that contains information about the area of each passed vdFigure object.
public VectorDraw.Render.PrimitivesExport.RenderProperties.EntityViewAreas GetVisibleArea(vdEntities entities, Vector VisibleDirection, double SquareRectSize)
Example in c# of the method below :

//Get the projection area in Front View of all entities in Model Layout
//set the equality to 0.01 that is 1 square centimeter in case we assume that 1 DrawingUnit represents 1 meter.The return area value will be in square Drawing Units (square meters in this case)

VectorDraw.Render.PrimitivesExport.RenderProperties.EntityViewAreas ret =document.GetVisibleArea(document.Model.Entities, new Vector(0,-1,0), 0.01);
double surfacesVisibleArea = ret.Area(false); //get the visible area of all entities surfaces.
double ProjectionToViewArea = ret.Area(true); //get the area that projected on the selected view.

You can iterate through the objects like following:
double area = 0.0d;
foreach (EntityViewArea item in ret)
{
vdFigure fig = item.Entity as vdFigure;
area += item.Area(projection);
}

Check out the AreaCalculation project in the VectorDraw Samples solution for more information on how to use this method. You can download the solution from our website's Downloads section.

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