DrTAD BLENDER CYCLES Tutorial – Glass Material BSDF + Reducing Noise
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This document provides a tutorial on creating glass materials using Blender Cycles and techniques for reducing render noise. It explains the properties of bidirectional scattering distribution functions (BSDFs) and how to manipulate parameters to achieve desired effects. Additionally, it offers practical steps for adding a glass material to scenes and optimizing render settings to improve performance and visual quality.
![2018 DrTAD 26
Resources
Blender software
https://www.blender.org/
Cycles Renderer » Materials » Surfaces
https://docs.blender.org/manual/en/dev/render/cycles/materials/surface.
html#surfaces
Glass BSDF
https://docs.blender.org/manual/en/dev/render/cycles/nodes/types/shad
ers/glass.html
Reducing Noise (Path Tracing - CC-BY-SA 4.0)
https://docs.blender.org/manual/en/dev/render/cycles/optimizations/redu
cing_noise.html
How To Reduce Noise In Cycles Render [duplicate]
https://blender.stackexchange.com/questions/18304/how-to-reduce-
noise-in-cycles-render?
utm_medium=organic&utm_source=google_rich_qa&utm_campaign
=google_rich_qa](https://image.slidesharecdn.com/glass-180507183438/85/DrTAD-BLENDER-CYCLES-Tutorial-Glass-Material-BSDF-Reducing-Noise-26-320.jpg)
DrTAD BLENDER CYCLES Tutorial – Glass Material BSDF + Reducing Noise
- 1. BLENDER CYCLES – Glass Material BSDF + Reducing Noise - TUTORIAL Assoc. Prof. Dr. Eng. Tihomir Dovramadjiev Technical University of Varna MTF, Department Industrial Design tihomir.dovramadjiev@tu-varna.bg DOI: 10.13140/RG.2.2.20000.28167 https://www.researchgate.net/publication/324993603_BLENDER_CYCLES_- _Glass_Material_BSDF_Reducing_Noise_-_Tutorial
- 2. 2018 DrTAD 2 Blender software – download & license Blender.org: “Open Source 3D creation. Free to use for any purpose, forever.” Blender software download: https://www.blender.org/download/ Blender software license: Free to use Blender for any purpose, including commercially or for education. This freedom is being defined by Blender’s GNU General Public License (GPL). https://www.blender.org/about/
- 3. 2018 DrTAD 3 Blender Cycles Renderer » Materials » Surfaces Surfaces: ● The surface shader defines the light interaction at the surface of the mesh. One or more BSDF’s specify if incoming light is reflected back, refracted into the mesh, or absorbed. Emission defines how light is emitted from the surface, allowing any surface to become a light source.
- 4. 2018 DrTAD 4 Blender Cycles Renderer » Materials » Surfaces ● Terminology: ● BSDF Stands for Bidirectional Scattering Distribution Function. It defines how light is reflected and refracted at a surface. ● Reflection BSDFs reflect an incoming ray on the same side of the surface. ● Transmission BSDFs transmit an incoming ray through the surface, leaving on the other side. ● Refraction BSDFs are a type of Transmission, transmitting an incoming ray and changing its direction as it exits on the other side of the surface.
- 5. 2018 DrTAD 5 Blender Cycles Renderer » Materials » Surfaces BSDF Parameters A major difference from non-physically-based renderers is that direct light reflection from lamps and indirect light reflection of other surfaces are not decoupled, but rather handled using a single BSDF. This limits the possibilities a bit, but we believe overall it is helpful in creating consistent- looking renders with fewer parameters to tune. ● Roughness For the glossy BSDFs, the roughness parameter controls the sharpness of the reflection, from 0.0 (perfectly sharp) to 1.0 (very soft). Compared to hardness or exponent parameters, it has the advantage of being in the range 0.0 to 1.0, and as a result gives more linear control and is more easily textureable. The relation is roughly: roughness = 1 - 1/hardness
- 6. 2018 DrTAD 6 Blender Cycles Fig. 1. Blender Cycles Render / default interface.
- 7. 2018 DrTAD 7 Blender World Fig. 2. Blender World. Surface > Color > Black. RGB: 0,0,0.
- 8. 2018 DrTAD 8 Blender Cycles Render: Test Fig. 3. Blender Cycles Render: Test.
- 9. 2018 DrTAD 9 Adding Plane to Scene Fig. 4. Adding plane to scene. Add > Mesh > Plane.
- 10. 2018 DrTAD 10 Resizing Plane Fig. 5. Manual resizing plane with “s” key.
- 11. 2018 DrTAD 11 Transform: Cube Location Fig. 6. Transform: Cube Location (View > Front (Numpad 1) + View Persp/Ortho (Numpad 5)).
- 12. 2018 DrTAD 12 Blender Cycles Render: Test Fig. 7. Blender Cycles Render: Test.
- 13. 2018 DrTAD 13 Light Options Fig. 8. Light Options.
- 14. 2018 DrTAD 14 Blender Cycles Render: Test Fig. 9. Blender Cycles Render: Test.
- 15. 2018 DrTAD 15 Adding Glass Material Fig. 10. Adding glass material (Type of active data o display and edit: Material).
- 16. 2018 DrTAD 16 Adding Glass Material Fig. 11. Adding glass material. Surface > Use Nodes > Surface > Glass BSDF / Beckman.
- 17. 2018 DrTAD 17 Blender Cycles Render: Test Fig. 12. Blender Cycles Render: Test. Image has noise.
- 18. 2018 DrTAD 18 Reducing Noise When performing a final render, it is important to reduce noise as much as possible. Here we will discuss a number of tricks that, while breaking the laws of physics, are particularly important when rendering animations within a reasonable time. Click to enlarge the example images to see the noise differences well. https://docs.blender.org/manual/en/dev/render/ cycles/optimizations/reducing_noise.html
- 19. 2018 DrTAD 19 Path Tracing Cycles uses path tracing with next event estimation, which is not good at rendering all types of light effects, like caustics, but has the advantage of being able to render more detailed and larger scenes compared to some other rendering algorithms. This is because we do not need to store, for example, a photon map in memory, and because we can keep rays relatively coherent to use an on-demand image cache, compared to e.g. bidirectional path tracing. We do the inverse of what reality does, tracing light rays from the camera into the scene and onto lights, rather than from the light sources into the scene and then into the camera. This has the advantage that we do not waste light rays that will not end up in the camera, but also means that it is difficult to find some light paths that may contribute a lot. Light rays will be sent either according to the surface BRDF, or in the direction of known light sources (lamps, emitting meshes with Sample as Lamp).
- 20. 2018 DrTAD 20 Blender Cycles – Reducing Noise – Samples & Clamp Indirect Fig. 13. Reducing Noise. Sampling > Samples: 400; Clamp Indirect 3.50.
- 21. 2018 DrTAD 21 Add Modifier – Solidify Fig. 14. Adding Modifier / Solidify to Cube.
- 22. 2018 DrTAD 22 Add Modifier – Solidify Fig. 15. Solidify Modifier. Thickness: 0.2 and Apply.
- 23. 2018 DrTAD 23 Final Result - 1 Fig. 16. Blender Cycles - Render. Final result - 1.
- 24. 2018 DrTAD 24 Adding Glass Sphere to Scene Fig. 17. Adding glass sphere to scene + yellow / orange color.
- 25. 2018 DrTAD 25 Final Result - 2 Fig. 18. Blender Cycles - Render. Final result - 2.
- 26. 2018 DrTAD 26 Resources Blender software https://www.blender.org/ Cycles Renderer » Materials » Surfaces https://docs.blender.org/manual/en/dev/render/cycles/materials/surface. html#surfaces Glass BSDF https://docs.blender.org/manual/en/dev/render/cycles/nodes/types/shad ers/glass.html Reducing Noise (Path Tracing - CC-BY-SA 4.0) https://docs.blender.org/manual/en/dev/render/cycles/optimizations/redu cing_noise.html How To Reduce Noise In Cycles Render [duplicate] https://blender.stackexchange.com/questions/18304/how-to-reduce- noise-in-cycles-render? utm_medium=organic&utm_source=google_rich_qa&utm_campaign =google_rich_qa