How to use this tutorial

The objective of every daylighting simulation method described in this tutorial is to estimate the perception of daylight-induced brightness inside a space. This perception can be approximately quantified in terms of luminance values captured in the pixels of a rendered image or through illuminance values measured at virtual measurement points. Section 2.2.1 provides a general process-based overview of the different simulation methods. Section 2.2.2 lists the different portions of the text relating to these methods.

Matrix-based daylighting simulations

In a broad sense, every daylighting simulation method covered in this tutorial can be described in three steps:

  1. Tracing the path of light from an indoor space to the sky (Calculation of flux transfer matrices).
  2. Estimating the brightness of the sky (Calculation of sky-vectors)
  3. Relating the brightness of the sky to the brightness inside a space (Multiplying, adding and transforming matrices from Steps A and B to generate illuminance and luminance values).

Figure 4 provides an overview of some of the simulation methods in terms of the steps described above. The description for every simulation method in Chapter 6 and Chapter 7 begins with such a schematic diagram.

As alluded by Figure 4, there are several procedural overlaps between the different simulation methods. For example, the F1-type F-Matrix simulation described in Section 7.2 employs the same set of commands and files for creating the View Matrix and Sky-vector as that for the Three Phase Method in Section 6.3.1. In such cases, where the intent and syntax of the commands in the workflow are the same, the explanation for them is provided only once. While avoiding repetition in this manner has made this document more concise, this somewhat disjointed way of describing simulations might be confusing to some readers. This potential issue has been addressed by listing the full set of commands for every simulation method in appropriately named appendices. The recommended way to work

Figure 4 Schematic overview of the Daylighting Coefficient Method, Three-Phase Method and the F-Matrix Method. The italicized terms such as oconv, vwrays and genskyvec refer to Radiance programs required for that particular aspect of the simulation. For example, Step A in the case of the Daylight Coefficient method involves the use of oconv to create an octree, vwrays and rfluxmtx to generate matrices for image-based simulation and rfluxmtx alone for illuminance-based simulation. Detailed descriptions of the schematic diagrams are provided in relevant sections in Chapter 6 and Chapter 7

through a simulation method described in Chapter 6 or Chapter 7 is by referring the appendices alongside the relevant sections.

Sections relevant to different daylighting simulation methods

The hyperlinked sections and appendices listed below relate to standard, base-case, simulations. Special cases and scenarios discussed for every simulation method are discussed in Chapter 6 and Chapter 7.

Daylight Coefficient Method

  • Background, research and relevant literature: 3.1
  • Workflow:
    • Creating flux transfer matrices: 6.2.1
    • Creating sky-vectors: 6.1
    • Generating results: 6.2.2
  • Complete set of commands: Appendix B

The Three-Phase Method

  • Background, research and relevant literature: 3.2
  • Conceptual Prerequisite(s): Daylight Coefficient Method, BSDFs.
  • Workflow:
    • Creating flux transfer matrices: 6.3.1
    • Creating sky-vectors: 6.1
    • Generating results: 6.3.2
  • Complete set of commands: Appendix C

The Five-Phase Method

  • Background, research and relevant literature: 3.3
  • Conceptual Prerequisite(s): Three-Phase Method.
  • Workflow: (The Five-Phase Method requires that a Three Phase Simulation be performed first).
    • Three Phase Method: 6.3.1, 6.1, 6.3.2
    • Direct solar component of Three Phase Method: 6.4.1.1
    • Accurate direct-sun calculation: 6.4.1.2
    • Generating results: 6.4.2
  • Complete set of commands: Appendix D

The F-Matrix Method

  • Background, research, relevant literature, theory: 3.2, 7.1
  • Conceptual Prerequisite(s): Three-Phase Method.
  • Workflow:
    • Creating flux-transfer matrices: 6.3.1 (for creating View and Transmission Matrices), 7.2 (F1-type simulation), 7.3(FH-type simulation), 7.4(FN-type simulation).
    • Creating sky-vectors: 6.1
    • Generating results: 7.5
  • Complete set of commands: Appendix E

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