HDR artifacts and request for tips

stem_athome

Diomede said:

 I tried one of the seemingly standard indoor hdr's from that site.  I still got splotchy results when I loaded the hdr version in Carrara.

The problem is with the high levels in the HDR and how Carrara samples the (HDR) light.

Other renderers used to have similar (although not so extream) issues. They have been updated to account for the issue.

 

If you needed to use such an HDR,  you would need to Tone-map the HDR, to bring the levels down. You could use such as Affinity Photo, or free apps such as Picturenaut.

 

A quick example.

Image 1, default HDR on a simple test scene.

Image 2 HDR tone-mapped then used on same scene. (tone-mappers have default settings that can be used)

 

 

 

 

Diomede

stem_athome said:

Diomede said:

 I tried one of the seemingly standard indoor hdr's from that site.  I still got splotchy results when I loaded the hdr version in Carrara.

The problem is with the high levels in the HDR and how Carrara samples the (HDR) light.

Other renderers used to have similar (although not so extream) issues. They have been updated to account for the issue.

 

If you needed to use such an HDR,  you would need to Tone-map the HDR, to bring the levels down. You could use such as Affinity Photo, or free apps such as Picturenaut.

 

A quick example.

Image 1, default HDR on a simple test scene.

Image 2 HDR tone-mapped then used on same scene. (tone-mappers have default settings that can be used)

Thank you.  Very helpful.  

3drendero

Hmm, get the free LuxusCore beta render plugin, render out the HDR on a flat surface and set the tonemapping there. Save as hdr and go back to the native renderer.

In case you want to stay inside Carrara...

Diomede

Thanks

stem_athome

3drendero said:

Hmm, get the free LuxusCore beta render plugin, render out the HDR on a flat surface and set the tonemapping there. Save as hdr and go back to the native renderer.

In case you want to stay inside Carrara...

So how did/would you export/save a 32bit .HDR from "Luxcore via Luxus"(free beta) ? When you finish/stop a render, the image is past back to a default carrara render window, so you do not have the option of saving to HDR.

If you use "Luxrender via Luxus"(that was/is sold), that render's via the Luxrender (standalone) UI. So when render finished/stopped, you can save the image directly from luxrender, but that only save's 32 bit image as .EXR

magaremoto

you should reckon to tune up the lighting quality up to excellent, many contrasted hdr maps may create splotches like that

3drendero

stem_athome said:

3drendero said:

Hmm, get the free LuxusCore beta render plugin, render out the HDR on a flat surface and set the tonemapping there. Save as hdr and go back to the native renderer.

In case you want to stay inside Carrara...

So how did/would you export/save a 32bit .HDR from "Luxcore via Luxus"(free beta) ? When you finish/stop a render, the image is past back to a default carrara render window, so you do not have the option of saving to HDR.

If you use "Luxrender via Luxus"(that was/is sold), that render's via the Luxrender (standalone) UI. So when render finished/stopped, you can save the image directly from luxrender, but that only save's 32 bit image as .EXR

Have not tried it for years, but an option is listed here undee 11.4: https://carraracafe.com/luxuscore-for-carrara-plugin-unofficial-manual-2015-02-15/ 11.4 EXR/HDR and multi-pass image export You will need to put something like the following in the config section: batch.periodicsave=15 film.outputs.1.type=RGB film.outputs.1.filename=image.exr This means every 15 seconds write an RGB image with filename image.exr. The file will apear in the extension folder. You can specify a path such as C:/Users/Spheric/Documents/image.exr You could also do stuff like write an HDR and a tonemapped png with batch.periodicsave=15 film.outputs.1.type=RGB film.outputs.1.filename=image.hdr film.outputs.2.type=RGB_TONEMAPPED film.outputs.2.filename=image.png types can be: RGB, RGBA, RGB_TONEMAPPED, RGBA_TONEMAPPED, ALPHA, DEPTH, POSITION, GEOMETRY_NORMAL, SHADING_NORMAL, MATERIAL_ID, DIRECT_DIFFUSE, DIRECT_GLOSSY, EMISSION, INDIRECT_DIFFUSE, INDIRECT_GLOSSY, INDIRECT_SPECULAR, MATERIAL_ID_MASK, DIRECT_SHADOW_MASK, INDIRECT_SHADOW_MASK, RADIANCE_GROUP, UV, RAYCOUNT, BY_MATERIAL_ID, and IRRADIANCE