Jonathan de Blok - JDBgraphics
Jonathan de Blok
About Me
Technical Artist with more then 20 years of experience in the CG industry.
専門知識
Generalist
INDUSTRY
Advertising / Motion Graphics | Film/TV
Houdini Skills
ADVANCED
Procedural Modeling | Digital Assets | Motion Editing | Animation | PDG | VEX | Python
INTERMEDIATE
Environments | Character Rigging | Hair & Fur | Cloth | Mantra | Karma | Lighting | Pyro FX
BEGINNER
Crowds | Muscles | Solaris | Fluids | Destruction FX | Realtime FX
Availability
I am available for Freelance Work
Recent Forum Posts
[h22] HDR output issue 2026年10月8日11:34
What the..
[h22] HDR output issue 2026年10月8日11:20
Samm update.. rendering to mplay does keep the full dynamic range, so it might be in the saving to exr part then..
[h22] HDR output issue 2026年10月8日10:54
Running into a strange issue..
I sort of made a reverse matcap thing, where a gray product render + AI generated normalmap are used to create a HDRI 360 map that has a no questions asked reconstruction of the light..
At the end of the process I have a sphere that has the guessed light intensity in a point attribute, it's values go from 0.0 to around 15.0
So I figured I put a cam in the middle, set it to polar lens and render out a 360 HDRI for reuse, that works fine only the EXR that is saved is clamped between for 0.0 to 1.0, as are live renders and render gallery renders. So I suspect it's some Karma setting/issue and an file format issue.
As a material it's a simple mtlxsurface_unlit with the material_properties wiring the point attribute in the emission:
(when I make the emission_color on the mtlxsurface, which is I guess multiplied with the emission amount, darker I see the highlights fade nicely, so the attribute is read in full range.
So where is this clipping happening?
I sort of made a reverse matcap thing, where a gray product render + AI generated normalmap are used to create a HDRI 360 map that has a no questions asked reconstruction of the light..
At the end of the process I have a sphere that has the guessed light intensity in a point attribute, it's values go from 0.0 to around 15.0
So I figured I put a cam in the middle, set it to polar lens and render out a 360 HDRI for reuse, that works fine only the EXR that is saved is clamped between for 0.0 to 1.0, as are live renders and render gallery renders. So I suspect it's some Karma setting/issue and an file format issue.
As a material it's a simple mtlxsurface_unlit with the material_properties wiring the point attribute in the emission:
(when I make the emission_color on the mtlxsurface, which is I guess multiplied with the emission amount, darker I see the highlights fade nicely, so the attribute is read in full range.
So where is this clipping happening?