A free open source modelling/rendering software

Transcription

1 A free open source modelling/rendering software

2 Rendering In short, rendering is the process of generating an image from a model or set of models in a scene file. Different styles ie. Photorealistic(Cycles), and Cartoon (Freestyle)

3 Modelling Creating objects by adding and manipulating faces Convention: To use quads (face with 4 edges and 4 vertices) connected to other faces Blender allows for individual vertex control as opposed to CAD software which uses geometric modelling

4 Basis of CG (Computer Generated) CG or CGI is everywhere (Movies/TV uses it extensively. Pretty much any car chase scene has to have CG as it is more cost effective and is just as good) Catalogue magazines eg. IKEA catalogues have 75% of their showcased items as renderings Tech product Ads usually showcase the object floating around with sleek shine (eg. IPhone Ads)

5 Why Blender? Free and open source Countless online tutorials (most free, there are online courses that cost money) It is just as good as other programs that cost an arm and a leg Blender is much more than just a modelling/rendering program.

6 Modelling (3D printing and Rendering)

7 Sculpting

8 Simulations (Fluids, Particles, Rigidbodies, Smoke)

9 And Lots More! Animation Video Editing Compositing Motion Tracking and Green Screen Implementation Hair and Fur Dynamics

10 What have I done? Created models for machining purposes such as plexiglass cutouts 3D printed components for rigs Recreated rigs in Blender to render images as figures for posters, publications and presentations. Created animations showcasing rigs

11 Modelling and Rendering Process

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13 Renderings of Homecages and Rigs

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15 Benefits of Rendering Rendering a scene allows you to capture an image or angle that would otherwise be impossible to get. It can provide snapshots of a system at different states without interfering (eg. mice in homecages pulling levers, dark chambers, etc.) Using a photorealistic approach, viewers are given a detailed view of the system while the creator has full control of lighting and camera placement

16 Photorealism The attempt of making the generated renderings resemble the real world. Uses PBR materials (Physically Based Rendering) which takes into consideration properties that can describe an object in the real world. Color (Texture Map), Roughness, Metallic Value, IOR (Index of Refraction) etc Many lists online on property values of many materials (metals, liquids, plastics, glass)

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18 How does it actually calculate the pixel colour value? Blender Cycles uses a method called Path Tracing to calculate colour Algorithm integrates over all the luminance at a single point on a surface and is then reduced by a surface reflectance function (BRDF) It is then repeated for every pixel in the camera resolution Path Tracing by nature simulates soft shadows, depth of field, motion blur, caustics, ambient occlusion, and indirect lighting

19 Recursive Path Tracing

20 Ray Casting from Camera to Scene (Primary Rays)

21 On contact with surface, Shadow Rays are cast Primary Ray Shadow Ray

22 If surface is metallic, cast reflective rays at incident angle Primary Ray Shadow Ray Reflection Ray

23 If reflective ray hits, repeat as primary ray Primary Ray Shadow Ray Reflection Ray

24 If surface is translucent use index of refraction to cast ray Primary Ray Shadow Ray Reflection Ray Refractive Ray

25 Turner Whitted first image produced using path tracing. Took 72 minutes to render yet now only takes 1/60th of a second thanks to Moore s Law

26 Bad things about Blender A lot of people say UI is very difficult to learn Learning curve is steep but very rewarding Blender s view control differs from industry standard Long time between major updates/feature add-ons

27 Before Blender demo, any questions?