DOI: 10.13140/RG.2.2.26074.08649 https://www.researchgate.net/publication/337170723_BLENDER_TUTORIAL_INDIRECT_LIGHTING Blender 2.79 Internal Render and Indirect Lighting Indirect Lighting adds indirect light bouncing of surrounding objects. It models the light that is reflected from other surfaces to the current surface. Is more comprehensive, more physically correct, and produces more realistic images. It is also more computationally expensive. Take a look at the following examples of a scene lit with Direct Lighting and both Direct and Indirect Lighting: Indirect Lighting only works with Approximate gather method. https://docs.blender.org/manual/en/2.79/render/blender_render/world/indirect_lighting.html - Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even videoediting and game creation. https://www.blender.org/. - Blender software. 2.79b Version. About, License & Development. https://www.researchgate.net/publication/328677236_Blender_software_279b_Version_About_License_Development - Modern accessible application of the system Blender in 3D design practice. https://www.researchgate.net/publication/312033613_Modern_accessible_application_of_the_system_Blender_in_3D_design_practice

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BLENDER TUTORIAL. INDIRECT LIGHTING
Presentation · November 2019
DOI: 10.13140/RG.2.2.26074.08649
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2. BLENDER TUTORIAL. INDIRECT
LIGHTING
Assoc. Prof. Tihomir Dovramadjiev PhD Eng.
Technical University of Varna
Department Industrial Design
tihomir.dovramadjiev@tu-varna.bg

3. 2019 2
BLENDER SOFTWARE
- Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—
modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video
editing and game creation. https://www.blender.org/.
- Blender software. 2.79b Version. About, License & Development.
https://www.researchgate.net/publication/328677236_Blender_software_279b_Version_About_Licen
se_Development
- Modern accessible application of the system Blender in 3D design practice.
https://www.researchgate.net/publication/312033613_Modern_accessible_application_of_the_syste
m_Blender_in_3D_design_practice

4. 2019 3
Indirect Lighting
Indirect Lighting adds indirect light bouncing of surrounding objects. It models the light that is reflected from other
surfaces to the current surface. Is more comprehensive, more physically correct, and produces more realistic
images. It is also more computationally expensive. Take a look at the following examples of a scene lit with Direct
Lighting and both Direct and Indirect Lighting:
Images courtesy of rastermon.com.
Links:
- https://docs.blender.org/manual/en/2.79/render/blender_render/world/indirect_lighting.html
- rastermon.com

5. 2019 4
Indirect Lighting only works with Approximate
gather method.
Options
The Indirect Lighting panel contains two options:
Factor
Defines how much surrounding objects contribute to light.
Bounces
Number of indirect diffuse light bounces.
The Gather panel contains settings for the indirect lighting quality. Note that these settings also apply to
Environment Lighting and Ambient Occlusion.
Links:
- https://docs.blender.org/manual/en/2.79/render/blender_render/world/indirect_lighting.html

6. 2019 5
Indirect Lighting only works with Approximate
gather method.
The Approximate method gives a much smoother result for the same amount of render time, but as its name states,
it is only an approximation of the Raytrace method, which implies it might produce some artifacts and it cannot use
the sky’s texture as the base color.
This method seems to tend to “over-occlude” the results. You have two complementary options to reduce this problem:
Passes
Set the number of pre-processing passes, between (0 to 10) passes. Keeping the pre-processing passes high will increase render time, but will
also clear some artifacts and over-occlusions.
Error
This is the tolerance factor for approximation error (i.e. the max allowed difference between approximated result and fully computed result). The
lower, the slower the render, but the more accurate the results… Ranges between (0.0 to 10.0), defaults to 0.250.
Pixel Cache
When enabled, it will keep values of computed pixels to interpolate it with its neighbors. This further speeds up the render, generally without
visible loss in quality…
Correction
A correction factor to reduce over-occlusion. Ranges between (0.0 to 1.0) correction.
Links:
- https://docs.blender.org/manual/en/2.79/render/blender_render/world/indirect_lighting.html

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The Scene / 3D Objects / Options
The Scene: Default 3D Cube + Plane / Options: World and Material Options

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Blender 2.79 Internal Render: First Rendered Result
Object Mode. Adding green emit material to 3D Cube

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Blender 2.79 Internal Render / World Indirect
Lighting
World / Activating Inderect Ligthting (Default Factor: 1) + Gather Approximate

10. 2019 9
Rendered Result
Blender 2.79 Internal Render: Rendered Image (Adding black Horizon Color + Sampling: Passes: 5

11. 2019 10
Blender 2.79 Internal Render: Result

12. 2019 11
REFERENCES
- Blender Software. https://www.blender.org/
- Tihomir Dovramadjiev PhD. Modern accessible application of the system Blender in 3D design
practice.
https://www.researchgate.net/publication/312033613_Modern_accessible_application_of_the_system_Blender_in_3D_design_practice
- Blender software. 2.79b Version. About, License & Development. DOI: 10.13140/RG.2.2.36167.75687
https://www.researchgate.net/publication/328677236_Blender_software_279b_Version_About_License_Development
- Blender 2.79 Reference Manual. https://docs.blender.org/manual/en/2.79/index.html
- Blender 2.79. Inderect Lighting Links:
- https://docs.blender.org/manual/en/2.79/render/blender_render/world/indirect_lighting.html
- rastermon.com
- Apace OpenOffice. http://www.openoffice.org/download/
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