Photographic Images
We have made high-quality pictures of the Cornell box in its current
configuration. The liquid-cooled Photometrics PXL1300L CCD camera has a
precision of 12 bits. We used 7 narrow-band filters to get a coarse sampling
across the visible spectrum. Dark current has been subtracted from the images,
and flat-field correction has been applied to account for the cosine fall-off
and the lens fall-off.
Synthetic Images
A synthetic image file, generated from the data below, is available
as a jpeg file
Scene Data
The reflectance data and the geometric data for the Cornell Box (with diffuse
objects) are presented below. The data are also available in two other formats:
- As an mdla file. MDLA is a format defined
at Cornell for scene descriptions, with specifications
that are easily extendible.
- As an Inventor file. The RGB reflectance values in
this file are for previewing purposes only; they do not correspond to the real
spectral data.
1. Camera parameters
| Position |
278 273 -800 |
| Direction |
0 0 1 |
| Up direction |
0 1 0 |
| Focal length |
0.035 |
| Width, height |
0.025 0.025 |
2. Surface reflectances
Surfaces are assumed to be Lambertian. The reflectance spectra have been
measured at discrete wavelengths (in nm).
| Wavelength | white | green | red |
|---|
| 400 | 0.343 | 0.092 | 0.040 |
| 404 | 0.445 | 0.096 | 0.046 |
| 408 | 0.551 | 0.098 | 0.048 |
| 412 | 0.624 | 0.097 | 0.053 |
| 416 | 0.665 | 0.098 | 0.049 |
| 420 | 0.687 | 0.095 | 0.050 |
| 424 | 0.708 | 0.095 | 0.053 |
| 428 | 0.723 | 0.097 | 0.055 |
| 432 | 0.715 | 0.095 | 0.057 |
| 436 | 0.710 | 0.094 | 0.056 |
| 440 | 0.745 | 0.097 | 0.059 |
| 444 | 0.758 | 0.098 | 0.057 |
| 448 | 0.739 | 0.096 | 0.061 |
| 452 | 0.767 | 0.101 | 0.061 |
| 456 | 0.777 | 0.103 | 0.060 |
| 460 | 0.765 | 0.104 | 0.062 |
| 464 | 0.751 | 0.107 | 0.062 |
| 468 | 0.745 | 0.109 | 0.062 |
| 472 | 0.748 | 0.112 | 0.061 |
| 476 | 0.729 | 0.115 | 0.062 |
| 480 | 0.745 | 0.125 | 0.060 |
| 484 | 0.757 | 0.140 | 0.059 |
| 488 | 0.753 | 0.160 | 0.057 |
| 492 | 0.750 | 0.187 | 0.058 |
| 496 | 0.746 | 0.229 | 0.058 |
| 500 | 0.747 | 0.285 | 0.058 |
| 504 | 0.735 | 0.343 | 0.056 |
| 508 | 0.732 | 0.390 | 0.055 |
| 512 | 0.739 | 0.435 | 0.056 |
| 516 | 0.734 | 0.464 | 0.059 |
| 520 | 0.725 | 0.472 | 0.057 |
| 524 | 0.721 | 0.476 | 0.055 |
| 528 | 0.733 | 0.481 | 0.059 |
| 532 | 0.725 | 0.462 | 0.059 |
| 536 | 0.732 | 0.447 | 0.058 |
| 540 | 0.743 | 0.441 | 0.059 |
| 544 | 0.744 | 0.426 | 0.061 |
| 548 | 0.748 | 0.406 | 0.061 |
| 552 | 0.728 | 0.373 | 0.063 |
| 556 | 0.716 | 0.347 | 0.063 |
| 560 | 0.733 | 0.337 | 0.067 |
| 564 | 0.726 | 0.314 | 0.068 |
| 568 | 0.713 | 0.285 | 0.072 |
| 572 | 0.740 | 0.277 | 0.080 |
| 576 | 0.754 | 0.266 | 0.090 |
| 580 | 0.764 | 0.250 | 0.099 |
| 584 | 0.752 | 0.230 | 0.124 |
| 588 | 0.736 | 0.207 | 0.154 |
| 592 | 0.734 | 0.186 | 0.192 |
| 596 | 0.741 | 0.171 | 0.255 |
| 600 | 0.740 | 0.160 | 0.287 |
| 604 | 0.732 | 0.148 | 0.349 |
| 608 | 0.745 | 0.141 | 0.402 |
| 612 | 0.755 | 0.136 | 0.443 |
| 616 | 0.751 | 0.130 | 0.487 |
| 620 | 0.744 | 0.126 | 0.513 |
| 624 | 0.731 | 0.123 | 0.558 |
| 628 | 0.733 | 0.121 | 0.584 |
| 632 | 0.744 | 0.122 | 0.620 |
| 636 | 0.731 | 0.119 | 0.606 |
| 640 | 0.712 | 0.114 | 0.609 |
| 644 | 0.708 | 0.115 | 0.651 |
| 648 | 0.729 | 0.117 | 0.612 |
| 652 | 0.730 | 0.117 | 0.610 |
| 656 | 0.727 | 0.118 | 0.650 |
| 660 | 0.707 | 0.120 | 0.638 |
| 664 | 0.703 | 0.122 | 0.627 |
| 668 | 0.729 | 0.128 | 0.620 |
| 672 | 0.750 | 0.132 | 0.630 |
| 676 | 0.760 | 0.139 | 0.628 |
| 680 | 0.751 | 0.144 | 0.642 |
| 684 | 0.739 | 0.146 | 0.639 |
| 688 | 0.724 | 0.150 | 0.657 |
| 692 | 0.730 | 0.152 | 0.639 |
| 696 | 0.740 | 0.157 | 0.635 |
| 700 | 0.737 | 0.159 | 0.642 |
3. Light source properties
The light source is approximated as having a constant reflectance of 0.78,
and the following emission spectrum:
| Wavelength | light |
|---|
| 400.0 | 0.0 |
| 500.0 | 8.0 |
| 600.0 | 15.6 |
| 700.0 | 18.4 |
4. Surface Geometry
The geometry has been measured from the physical Cornell Box. The surfaces are
therefore not perfectly perpendicular. All surfaces are quadrilaterals. They
are specified below by their vertices.
| Floor |
|---|
| white |
552.8 0.0 0.0
0.0 0.0 0.0
0.0 0.0 559.2
549.6 0.0 559.2
|
| Holes (for disc. mesh) |
130.0 0.0 65.0
82.0 0.0 225.0
240.0 0.0 272.0
290.0 0.0 114.0
423.0 0.0 247.0
265.0 0.0 296.0
314.0 0.0 456.0
472.0 0.0 406.0
|
| Light |
|---|
| light |
343.0 548.8 227.0
343.0 548.8 332.0
213.0 548.8 332.0
213.0 548.8 227.0
|
| Ceiling |
|---|
| white |
556.0 548.8 0.0
556.0 548.8 559.2
0.0 548.8 559.2
0.0 548.8 0.0
|
| Hole (for disc. mesh) |
343.0 548.8 227.0
343.0 548.8 332.0
213.0 548.8 332.0
213.0 548.8 227.0
|
| Back wall |
|---|
| white |
549.6 0.0 559.2
0.0 0.0 559.2
0.0 548.8 559.2
556.0 548.8 559.2
|
| Right wall |
|---|
| green |
0.0 0.0 559.2
0.0 0.0 0.0
0.0 548.8 0.0
0.0 548.8 559.2
|
| Left wall |
|---|
| red |
552.8 0.0 0.0
549.6 0.0 559.2
556.0 548.8 559.2
556.0 548.8 0.0
|
| Short block |
|---|
| white |
130.0 165.0 65.0
82.0 165.0 225.0
240.0 165.0 272.0
290.0 165.0 114.0
290.0 0.0 114.0
290.0 165.0 114.0
240.0 165.0 272.0
240.0 0.0 272.0
130.0 0.0 65.0
130.0 165.0 65.0
290.0 165.0 114.0
290.0 0.0 114.0
82.0 0.0 225.0
82.0 165.0 225.0
130.0 165.0 65.0
130.0 0.0 65.0
240.0 0.0 272.0
240.0 165.0 272.0
82.0 165.0 225.0
82.0 0.0 225.0
|
| Tall block |
|---|
| white |
423.0 330.0 247.0
265.0 330.0 296.0
314.0 330.0 456.0
472.0 330.0 406.0
423.0 0.0 247.0
423.0 330.0 247.0
472.0 330.0 406.0
472.0 0.0 406.0
472.0 0.0 406.0
472.0 330.0 406.0
314.0 330.0 456.0
314.0 0.0 456.0
314.0 0.0 456.0
314.0 330.0 456.0
265.0 330.0 296.0
265.0 0.0 296.0
265.0 0.0 296.0
265.0 330.0 296.0
423.0 330.0 247.0
423.0 0.0 247.0
|
|
