During this guided tour you will create a simple 3d scene by means of the
Helios 3d editor containing a house and a tree, and you will calculate the
shadow cast by these objects.
Furthermore, you will calculate the energy output of a photovoltaic solar
power plant located on the house roof under consideration of the shadow.
Start: Empty Scene
After starting Helios, click in the toolbar on the button
Editor for 3d scene.
In the main frame of Helios the right half disappears and in the left half the
editor window is displayed. Additionally, a second window containing the 3d scene appears:
Components of the 3d Scene
The initially empty scene contains three elements:
- Compass rose with indicator of the sun position:
The grey-black arrow on the ground points to North. The yellow triangle indicates
the current sun position.
- Ground plane: The green plane represent the ground surface.
- Coordinate system: The three shown arrows represent the coordinate system
which has its origin at the intersection of the arrows. The z-axis points upwards, whereas
the x- and y-axis span the surface.
When looking from above down to the coordinate system, such that one axis points upwards and
one axis points to the left, the axis pointing upwards is the x-axis (in the image above, it is the
axis pointing backwards).
Each specification of a point in the 3d scene comes with three values which denote the
x-, y-, and the z-coordinate. For example, a point which is 1 metre away from the coordinate
origin along the x-axis and which is 3 metres above the ground, has the coordinates (1,0,3).
It does not matter by the way, which unit (metre, centimetre, etc.) is used, as long as the same
unit is used for all coordinate specifications.