Post on 01-Apr-2018
Radiance Rendering Acceleration
Andrei KolomenskiMEIT
Andrei.Kolomenski@nasa.gov
James C. MaidaNASA JSC
James.C.Maida@nasa.gov
https://ntrs.nasa.gov/search.jsp?R=20150021137 2018-05-27T13:12:45+00:00Z
Benchmark SetupHardware:
CPU: Interl XeonC CPU X5670 @ 4Ghz / 49,152 MB RAMGPU: EVGA GeForce GTX 980 SC / 4 GB VRAM
Software:Radiance x64 5.0.a.3 https://github.com/NREL/Radiance/releasesAccelerad x64 0.3 (5.0.a.3) http://web.mit.edu/sustainabledesignlab/projects/Accelerad/
RPICT Rendering Parameters for ISS Interior
Truth: -lr 9 -lw 0.0005 -ps 1 -pt 0.05 -ss 2 -st 0 -as 256 -dr 3 -dp 1024 -ds 0 -dt 0 -dc 1 -ab 11 -ar 256 -aa 0 -ad 2048Constant: -lr 7 -lw 1.00e-03 -ps 4 -pt 0.05 -dr 1 -dp 512 -dt 0.05 -dc 0.5Dynamic (Default): -ab 5 -aa 0.1 -ds 0.1 -st 0.1 -x 1024 -y 1024
Absolute CPU or GPU Error = abs(CPU or GPU image – Truth image)Relative Error = abs(CPU image – GPU image)
11.5
3.9
1.9
1.3
0
5
10
15
20
25
30
35
40
0
1
2
3
4
5
6
7
8
9
10
480 680 880 1080 1280 1480 1680 1880 2080
Lum
inan
ce (
cd/m
2)
Co
mp
uta
tio
n T
ime
(h
ou
rs)
Square Pixel Resolution (-x -y)
Image Resolution VS Computation Time for ISS Interior
CPU Time GPU Time Relative Error CPU Absolute Error GPU Absolute Error
ALL FALSE COLOR IMAGES shown are Relative Error Images
Dynamic RPICT Parameters:-ab 5 -aa 0.1 -ds 0.1 -st 0.1 -x 1024 -y 1024
Average Relative Error = 21.7 cd/m^2
Error is concentrated around adjacent surfaces next to light sources.
1.4
CPU Error
3.8
1.70.6
0
5
10
15
20
25
30
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
Lum
inan
ce (
cd/m
2)
Co
mp
uta
tio
n T
ime
(h
ou
rs)
Ambient Accuracy (-aa)
Ambient Accuracy VS Computation Time for ISS Interior
CPU Time GPU Time Relative Error CPU Absolute Error GPU Absolute Error
-aa 0 -aa 0.4
Ambient Accuracy –aa
Dynamic RPICT Parameters: -ab 5 -ds 0.1 -st 0.1 -x 1024 -y 1024
0
5
10
15
20
25
30
0
1
2
3
4
5
6
1 2 3 4 5 6 7 8 9
Lum
inan
ce (
cd/m
2)
Co
mp
uta
tio
n T
ime
(h
ou
rs)
Ambient Bounces (-ab)
Ambient Bounces VS Computation Time for ISS InteriorCPU Time GPU Time Relative Error CPU Absolute Error GPU Absolute Error
Ambient Bounces –ab
-ab 1 -ab 8
Dynamic RPICT Parameters: -aa 0.1 -ds 0.1 -st 0.1 -x 1024 -y 1024
4.8
1.2
3.84.5 4.7
0
5
10
15
20
25
30
0
1
2
3
4
5
6
7
8
9
10
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
Lum
inan
ce (
cd/m
2)
Co
mp
uta
tio
n T
ime
(h
ou
rs)
Direct Sampling (-ds)
Direct Sampling VS Computation Time for ISS Interior
CPU Time GPU Time Relative Error CPU Absolute Error GPU Absolute Error
Direct Sampling –ds
-ds 0 -ds 0.4
Dynamic RPICT Parameters: -ab 5 -aa 0.1 -st 0.1 -x 1024 -y 1024
2.6
2.5
3.64.0
3.5
0
10
20
30
40
50
60
0
1
2
3
4
5
6
0 0.05 0.1 0.15 0.2 0.25 0.3
Lum
inan
ce (
cd/m
2)
Co
mp
uta
tio
n T
ime
(h
ou
rs)
Specular Threshold (-st)
Specular Threshold VS Computation Time for ISS Interior
CPU GPU Relative Error Absolute CPU Error Absolute GPU Error
Specular Threshold –st
Dynamic RPICT Parameters: -ab 5 -aa 0.1 -ds 0.1 -x 1024 -y 1024
-st 0 -st 0.3