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i noticed this version has no "WorldEnd" in any of the pbrt files. This was not an issue on v3. Is that intentional ? It's throwing up on my pbrt parser

Hi, the suggested command for converting from an .exr file to a .png is not valid:

The line in question: https://github.com/mmp/pbrt-v4-scenes/blob/master/transparent-machines/frame1266.pbrt#L5

pbrt sportscar-sky.pbrt
pbrt version 4 (built Aug 20 2020 at 11:25:44)
Copyright (c)1998-2020 Matt Pharr, Wenzel Jakob, and Greg Humphreys.
The source code to pbrt (but *not* the book contents) is covered by the BSD License.
See the file LICENSE.txt for the conditions of the license.
Error: Unable to read image file "textures/sky.exr": Cannot read image file "textures/sky.exr". No such file or directory.

There are other textures in other directories which I could link to (or copy over) but they might be not the ones shipping with that particular scene:

find .. -name sky.exr -exec ls -lag {} \;
-rw-r--r-- 1 jan 23261141 Aug 20 11:31 ../villa/textures/sky.exr
-rw-r--r-- 1 jan 24459819 Aug 20 11:31 ../transparent-machines/textures/sky.exr
-rw-r--r-- 1 jan 1523025 Aug 20 11:31 ../sanmiguel/textures/sky.exr
-rw-r--r-- 1 jan 94939234 Aug 20 11:31 ../smoke-plume/textures/sky.exr
-rw-r--r-- 1 jan 23480046 Aug 20 11:31 ../landscape/textures/sky.exr
-rw-r--r-- 1 jan 3433 Aug 20 11:31 ../ganesha/textures/sky.exr
-rw-r--r-- 1 jan 1880396 Aug 20 11:31 ../barcelona-pavilion/textures/sky.exr

I adapted the Mitsuba scene file of the cloud dataset provided by Disney to the new pbrt-v4 file description format, and converted the OpenVDB file representing the cloud's density to a NanoVDB file.

The content is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License and the file size is about 4Go at full resolution, 90Mo at "quarter" resolution.
Do you think it could be incorporated it in the pbrt-v4-scenes, and would you like me to do so ?

Here is the scene with the quarter resolution cloud rendered using pbrt-v4 with 256 samples per pixel.

Hello,

I happened to be working a little bit on the Landscape scene, and noticed that there seems to be a few empty Object groups/instances:

AttributeBegin
    ObjectBegin "Brennnessel Instance.4"
    ObjectEnd
AttributeEnd

AttributeBegin
    ObjectBegin "xref_Picea_5mt.c4d Instance"
    ObjectEnd
AttributeEnd

Is there perhaps some missing geometry here, or am I misunderstanding how the (empty) ObjectBegin statement works?

I have to admit the curly-hair.pbrt is really big...I am using RTX3060 with VS2019 on windows...still get the "CUDA error: out of memory"..... Is hair-actual-bsdf.pbrt tested on GPU?

PBRT commit 44eaab0 (6/26) removed "tint" as a parameter from "dielectric". The bistro materials (materials.pbrt, line 731) is still using "tint", and hence the renderer fails with an unused parameter error.

Hi,

I tried to build pbrt-v4 on a system with GTX 970 (Maxwell GPU).. seems unsupported claiming sm_53 minimum..

it's a little unfortunate since this devices are still supported by Optix 7.5 (latest versions):
"● All NVIDIA GPUs of Compute Capability 5.0 (Maxwell) or higher are supported"

hacked the build and seems getting lots of half errors in CUDA code..
*question is: how much effort is needed to enable support on this devices?

I mean can't be a question of performance as even sm_60 devices (Pascal) had abismal low FP16 performance (many times slower than FP32) at least the geforce parts not GP100.. little FP16 units were added only for developer playing with FP16 early..

all the GPU performance gained vs CPU from PBRT is due to Optix, right?

thanks..

Some of the plant colors aren't great. This green is particularly off: