Tihomir Dovramadjiev PhD. Blender Tutorial. Various 3D Objects. Mirror Reflections and Lighting
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This document is a tutorial on using Blender software for creating 3D objects, with a focus on techniques for achieving mirror reflections and lighting effects. It discusses concepts such as ray tracing, reflectivity, and indirect lighting to enhance the realism of 3D renders. The tutorial includes practical examples and links to additional resources for further learning.
Tihomir Dovramadjiev PhD. Blender Tutorial. Various 3D Objects. Mirror Reflections and Lighting
- 1. See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/337198734 BLENDER TUTORIAL. VARIOUS 3D OBJECTS. MIRROR REFLECTIONS AND LIGHTING Presentation · November 2019 DOI: 10.13140/RG.2.2.23963.82724 CITATIONS 0 READS 5 1 author: Some of the authors of this publication are also working on these related projects: 2018 NP -17 Study of design possibilities and optimization of computer calculation processes in industrial design practice View project 2017 NP 15 №230 Technical University of Varna. “Anodizing titanium and titanium alloys for use in medicine”. View project Tihomir Dovramadjiev Technical University of Varna 170 PUBLICATIONS 13 CITATIONS SEE PROFILE All content following this page was uploaded by Tihomir Dovramadjiev on 12 November 2019. The user has requested enhancement of the downloaded file.
- 2. BLENDER TUTORIAL. VARIOUS 3D OBJECTS. MIRROR REFLECTIONS AND 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 Mirror Reflections Mirror reflections are computed in the Blender Render and Cycles Renderers using ray tracing. (n.b. Reflections are not available in the Game Engine). Ray tracing can be used to make a material reflect its surroundings, like a mirror. The principle of ray-traced reflections is very simple: a ray is fired from the camera and travels through the scene until it encounters an object. If the first object hit by the ray is not reflective, then the ray takes the color of the object. If the object is reflective, then the ray bounces from its current location and travels up to another object, and so on, until a non-reflective object is finally met and gives the whole chain of rays its color. Eventually, the first reflective object inherits the colors of its environment, proportional to its Reflectivity value. Obviously, if there are only reflective objects in the scene, then the render could last forever. This is why a mechanism for limiting the travel of a single ray is set through the Depth value: this parameter sets the maximum number of bounces allowed for a single ray. Note You need to enable ray tracing in your scene settings if you want to use ray-traced reflections. This is done in the Render Shading panel.‣ The Mirror Color in the mirror panel is the color of the light reflected back. Usually, for normal mirrors, use white. However, some mirrors color the reflection (e.g. metals), so you can change the color by clicking on the color button. The amount of mirrored reflection is determined by the Reflectivity value. If set to something greater than 0, mirrored reflectivity will be activated and the reflection willbe tinted the color set in Mirror Color. Links: https://docs.blender.org/manual/en/2.79/render/blender_render/materials/properties/mirror.html Attribution-ShareAlike 2.0 Generic (CC BY-SA 2.0) https://creativecommons.org/licenses/by-sa/2.0/
- 5. 2019 4 Mirror Reflections / Options Enable ray-traced reflections Enable or disable ray-traced reflections. Reflectivity Sets the amount of reflectiveness of the object. Use a value of 1.0 if you need a perfect mirror, or set it to 0.0 if you do not want any reflection. Mirror Color Color of mirrored reflection By default, an almost perfectly reflective material like chrome, or a mirror object, will reflect the exact colors of its surrounding. But some other equally reflective materials tint the reflections with their own color. This is the case for well-polished copper and gold, for example. In order to replicate this within Blender, you have to set the Mirror Color accordingly. To set a mirror color, simply click the color button in the mirror panel and select a color. Link: https://docs.blender.org/manual/en/2.79/render/blender_render/materials/properties/mirror.html
- 6. 2019 5 Mirror Reflections / Anisotropic The shape of the reflection, from 0.0 (circular) to 1.0 (fully stretched along the tangent). If the Tangent Shading is on, Blender automatically renders blurry reflections as anisotropic reflections. When Tangent is switched on, the Anisotropic slider controls the strength of this anisotropic reflection, with a range of 1.0 (default) being fully anisotropic and 0.0 being fully circular, as-is when tangent shading on the material is switched off. Anisotropic ray-traced reflection uses the same tangent vectors as for tangent shading, so you can modify the angle and layout the same way, with the auto-generated tangents, or based on the mesh’s UV coordinates. Link: https://docs.blender.org/manual/en/2.79/render/blender_render/materials/properties/mirror.html
- 7. 2019 6 Mirror Reflections / Fresnel Examples Demonstration of the Fresnel effect. With values equal to (from top to bottom) 0.0, 2.5 and 5.0. Link: https://docs.blender.org/manual/en/2.79/render/blender_render/materials/properties/mirror.html
- 8. 2019 7 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
- 9. 2019 8 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
- 10. 2019 9 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
- 11. 2019 10 Tutorial
- 12. 2019 11 The Scene / 3D Objects / Options Toggle Quad View
- 13. 2019 12 The Scene / 3D Objects 3D Objects: Plane, Sphere, Pyramid & Text
- 14. 2019 13 The Sphere Object Mode. 1. Selecting 3D Sphere, 2. Click on Material and 3. New Material
- 15. 2019 14 The Sphere / Material Mirror Activating Mirror / Enable Raytraced Reflections.
- 16. 2019 15 The Sphere + Reflectivity Activating Mirror / Enable Raytraced Reflections. Reflecivity: 0.3
- 17. 2019 16 The Sphere + Reflectivity Activating Mirror / Enable Raytraced Reflections. Reflecivity: 0.65
- 18. 2019 17 The Sphere + Reflectivity Activating Mirror / Enable Raytraced Reflections. Reflecivity: 1
- 19. 2019 18 The Sphere + Reflectivity + Fresnel Activating Mirror / Enable Raytraced Reflections. Reflecivity: 1 + Fresnel: 0.2
- 21. 2019 20 The Pyramid Object Mode. 3D Pyramid: New Material / Diffuse: Yellow color + Emit: 1.5
- 22. 2019 21 World + Indirect Lighting World / Indirect Lighting: Factor: 1 and Gather: Approximate
- 23. 2019 22 3D Text Object Mode. 3D Text: New Material / Diffuse: Green Color + Transparency and Raytrace / Fresnel: 2.5
- 24. 2019 23 Result 1 Blender 2.79 Internal Render: Rendered Image
- 26. 2019 25 Toggle Quad View and positions Arrange position of 3D Text
- 27. 2019 26 Toggle Quad View and positions Arrange position of Camera
- 28. 2019 27 The Rendered Scene and Lighting Rendered Preview
- 29. 2019 28 Result 2 Blender 2.79 Internal Render: Rendered Image
- 30. 2019 29 Variant 3 Blender 2.79 Internal Render: Rendered Image
- 31. 2019 30 Toggle Quad View and positions Arrange position of Camera
- 32. 2019 31 The Rendered Scene and Lighting Rendered Preview
- 33. 2019 32 Result 3 Blender 2.79 Internal Render: Rendered Image
- 35. 2019 34 The 3D Pyramid 3D Pyramid: Emit: 0.05, Mirror Reflectivity: 0.7 and Fresnel: 0.5
- 36. 2019 35 Result 4 Blender 2.79 Internal Render: Rendered Image
- 38. 2019 37 3D Pyramid + Solid Object Mode. 3D Pyramid and activating Modifier Solidify. Thickness: 0.5 and Apply
- 39. 2019 38 Rendered Result 3D Pyramid Material. Activating Transparency and Raytrace: 3
- 40. 2019 39 Result 5 Blender 2.79 Internal Render: Rendered Image
- 41. 2019 40 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.Mirror Reflections https://docs.blender.org/manual/en/2.79/render/blender_render/materials/properties/mirror.html - Blender 2.79. Inderect Lighting Links: - https://docs.blender.org/manual/en/2.79/render/blender_render/world/indirect_lighting.html - rastermon.com - Tihomir Dovramadjiev PhD. BLENDER TUTORIAL. INDIRECT LIGHTING. DOI: 10.13140/RG.2.2.26074.08649. https://www.researchgate.net/publication/337170723_BLENDER_TUTORIAL_INDIRECT_LIGHTING - Attribution-ShareAlike 2.0 Generic (CC BY-SA 2.0) https://creativecommons.org/licenses/by-sa/2.0/ - Apace OpenOffice. http://www.openoffice.org/download/ View publication statsView publication stats