Exit Surface

Exit Surface

When using Simulation Mode to reduce the length and burden of computations, you must designate one or more surfaces as Exit Surfaces to display Irradiance Maps.

FIGURE 4.24 - Exit Surface dialog

TracePro optionally collects flux and incident ray coordinates and directions for each surface in addition to collecting data for candela plots. Rays do not necessarily “exit” on this surface, but this is a commonly used term for this surface.

Once the Exit Surfaces are defined, rays may be traced in Simulation Mode. To view analysis output, Select a surface as if using Analysis Model and display the plot. If the plot is displayed and no selection is made the data from the first Exit Surface defined will be used. If an object or non-exit surface is selected a message will be displayed in any open plots or tables requesting the selection of a valid Exit Surface.

Before beginning a raytrace in Simulation Mode, you must first specify the exit surface(s). Do this by the following sequence:

1.Select the surface for which you want to collect flux and irradiance data.

2.Select Define|Apply Properties to open the dialog box.

3.Choose the Exit Surface tab in the dialog box.

4.Check the Exit Surface check box.

5.Click the Apply button at the bottom of the dialog box.

TracePro 5.0 User’s Manual

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Applying Properties

TABLE 4.4. Exit Surface Options.

	Exit surface		Set the check box to enable/disable the surface’s Exit surface property.
	Number of		Set the number of ray to trace during Reverse Raytrace (Standard and Expert
	reverse rays		Only)
	Name		Selects one of the Predefined Irradiance Map orientations.
	Add		Add a new Irradiance Map orientation.
	Modify		Modify a new Irradiance Map orientation.
	Delete		Delete a new Irradiance Map orientation.
Standard	Expert	The Exit Surface dialog is used to define the number of Reverse Rays to trace
		when using Reverse Raytrace. See “Reverse Ray Tracing ” on page 5.28.

Predefined irradiance map orientation

The Predefined irradiance map orientation is used to define the Normal and Up vectors for Irradiance Maps and the Irradiance Map viewer. See “Irradiance/ Illuminance Viewer” on page 6.59. The data and dialog are shown in Table 4.5 and Figure 4.25 respectively.

TABLE 4.5. Irradiance Map Orientation Options.

Name	Sets the Predefined Irradiance Map orientation name.
Normal Vector	The Normal Vector is a vector in 3D space that is used to orient the
	projection plane for the irradiance map. The plane is defined to be per-
	pendicular to the Normal Vector, and the irradiance incident on the
	selected surface is projected onto this plane.
Up Vector	The Up Vector is a vector in 3D space that is used to orient the projec-
	tion plane for the irradiance map. The plane is defined so that the Up
	Vector is parallel to the vertical side of the plane. The irradiance inci-
	dent on the selected surface is projected onto this plane.

FIGURE 4.25 - Irradiance Map orientation dialog

4.32	TracePro 5.0 User’s Manual