Daysim and Photonmapping Jan Wienold
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1 Daysim and Photonmapping Jan Wienold Fraunhofer Institute for Solar Energy Systems Freiburg, Germany 1
2 Daysim pmap - overview Introduction Photon mapping Current restrictions Implementation into daysim Header file Structure of the header file Important Keywords Photon-mapping Keywords 2
3 Daysim pmap - overview Introduction Photon mapping Current restrictions Implementation into daysim Header file Structure of the header file Important Keywords Photon-mapping Keywords 3
4 pmap - Introduction Why? Calculation of caustics Fast calculation of specular/mirror materials as geometry (important also for glare evaluation) 4
5 pmap - Introduction Two-pass method based on Monte Carlo 1. Forward pass emits photons from light sources, scatters/absorbs at objects, deposits on diffuse surfaces ) mkpmap 2. Photon Gathering: Backward pass evaluates irradiance from photons using RADIANCE s ambient calculation 5
6 pmap - Introduction Two-pass method based on Monte Carlo 1. Forward pass emits photons from light sources, scatters/absorbs at objects, deposits on diffuse surfaces ) mkpmap 2. Photon Gathering: Backward pass evaluates irradiance from photons using RADIANCE s ambient calculation 6
7 Photon-mapping: Forward pass Emmission of Photons Storage of Photons in scene photon-map Source: Roland Schregle 7
8 Photon-mapping: Gathering Gathering using one bounce backwards raytracing Density estimate Source: Roland Schregle 8
9 Photon-mapping photonport: Increase efficiency of photon distribution Source: Roland Schregle 9
10 Pmap - Implementation into RADIANCE mkpmap : emission of the photons and storage in file gathering with modified versions of rtrace rpict rvu rpiece When no pmap options are used -> common RADIANCE raytraycing is used Based on Radiance code Dec ( between 4.0 and 4.1 ) At the moment, package is only available for linux and cygwin, windows version will be available autumn
11 Daysim pmap - overview Introduction Photon mapping Current restrictions Implementation into daysim Header file Structure of the header file Important Keywords Photon-mapping Keywords 11
12 Photon mapping in Radiance and Daysim current restrictions Illuminance/Irradiance calculation directly only on surfaces Glow material not reliable Photon port only without obstruction -> will be solved until spring next year Windows version missing -> solved within the next weeks 12
13 Daysim pmap - overview Introduction Photon mapping Current restrictions Implementation into daysim Header file Structure of the header file Important Keywords Photon-mapping Keywords 13
14 Pmap - Implementation into daysim Calculation also in two steps, photon distribution with modified version of mkpmap gathering with modified version of rtrace_dc Only rtrace_dc is replaced, all other tools/functionalities are the same as daysim classic Fully boxed Only some few additional keywords in the header-file Pmap will be stored only for static shading option For advanced shading, pmap will be deleted between calculations 14
15 Pmap - Implementation into daysim Process of complex fenestration 3-D geometric model of fenestration system Add few additional pmap parameters to header file Replace headerfile for gen_dc dir call That s it! Easy to use 15
16 Daysim the header file The headerfile contains all necessary configuration settings to run daysim Idea: command headerfile -> result Structure: keyword value(s) No keyword: default value 28
17 Daysim the header file #==================== # DAYSIM 2.1.P2header file # Thu Jan 31 15:54:33 CET 2008 #==================== project_name project_directory bin_directory tmp_directory material_directory v005 /paper_bsim2011/radiance/daysim/v005/ /usr/local/radiance/daysim/bin/ /paper_bsim2011/radiance/daysim/v005/tmp/ /paper_bsim2011/radiance/daysim/v005/ viewpoint_file /paper_bsim2011/radiance/daysim/view.vf 29
18 Daysim the header file ################## # site information ################## 1: solar range (->irrad calculation) 2: visible range (->illuminance, luminance calculation) place Frankfurt latitude 50.1 longitude time_zone -15 site_elevation 125 ground_reflectance 0.2 wea_data_file frankfurt.wea wea_data_file_units 1 first_weekday 1 time_step 60 wea_data_short_file wea_new/frankfurt.wea wea_data_short_file_units 1 lower_direct_threshold 2 lower_diffuse_threshold 2 output_units 2 30
19 Daysim the header file 1: Static shading: Shading is included in model Only 1 variant is calculated per headerfile ###################### # building information ###################### material_file materials.rad geometry_file v005_trans_0_0.rad sensor_file grid_illum_daysim shading 1 static_system illum_v005_0_0.dc illum_v005_0_0.ill Name prefix stored in tmp directory for Direct dc, Diffuse dc Result illuminance file Merged dc file 31
20 Daysim the header file ###################### # RADIANCE parameters ###################### ab 5 ad 8192 as 4096 ar 256 aa 0.1 lr 6 st sj lw dj ds 0.0 dr 2 dp
21 Daysim the header file the non default hidden options Sun interpolation 0: Interpolation (default) 1: Nearest neighbour (deleted from daysim) 2: Shadow testing coupling_mode 1 dgp_check_file path+prefix e.g. tmp/testing dgp_image_x_size 800 dgp_image_y_size
22 Daysim Direct calculation - interpolation Interpolation (default) Shadow testing Nearest neighbour 34
23 Daysim the header file the photon mapping options Switch photon mapping on calculation_mode photonmap The photon-mapping files may be large! (here around 2GB!) pmap_apg_file tmp/v005_0_0_pmap_daysim.gp pmap_apg_nphotons pmap_apg_bwidth 200 pmap_apd 2 pmap_apc_file tmp/v005_0_0_pmap_daysim.cp pmap_apc_nphotons pmap_apc_bwidth
24 Daysim sensors Unit sensors 0: illuminance (lux) 1: luminance (cd/m²) 2: irradiance (W/m²) 3: radiance (W/m²sr) sensor_file_unit No keyword -> all sensors treated as illuminance sensor If keyword, all units must be set! (be careful when having large number of sensors) 36
25 Daysim generate daylight coefficients: gen_dc Diffuse DC s: gen_dc headerfile -dif Direct DC s: gen_dc headerfile -dir Merge DC s together: gen_dc headerfile -paste Apply DC to weather file ds_illum headerfile 37
26 Daysim photon mapping process Diffuse DC s use standard daysim, without photon mapping): gen_dc headerfile_standard -dif Direct DC s use pmap daysim: gen_dc headerfile_pmap -dir Merge DC s together: gen_dc headerfile -paste Apply DC to weather file ds_illum headerfile 38
27 Daysim pmap - outline Linux/cygwin version available from Oct 1 st 2012 on (on request also from today) Currently compiling under windows also, available this autumn Pmap update (to current radiance version, solve sensor issue, solve glow issue, solve photon-port issue) -> planned in spring
28 Daysim gen_dgp_profile Usage is easy: gen_dgp_profile headerfile Process: 1. Step: gen_dgp_profile uses daysim to calculate the vertical illuminance at given viewpoint 2. Step: calculate a simplified image + dgp hourly output hourly dgp-values (prefix.dgp) What you need: viewpoint_file filename Special options: gen_dgp_profile headerfile d calculates only dgp (2. Step), no illuminance calculation 63
29 Thank you for your attention!! 67
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