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Rendering, Cameras & Lighting

Rendering, Cameras & Lighting. CGDD 4113. Jeff Chastine. Rendering. The process of converting your scene into a 2D image For gaming, we don’t care about it that much (but still important) Click on a View (the header) and then use menus and shelf For this class, use standard menu bar

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Rendering, Cameras & Lighting

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  1. Rendering, Cameras & Lighting CGDD 4113 Jeff Chastine

  2. Rendering • The process of converting your scene into a 2D image • For gaming, we don’t care about it that much (but still important) • Click on a View (the header) and then use menus and shelf • For this class, use standard menu bar • Open rendering view • Render Single Frame* • IPR Rendering • Render Settings* • After rendering, you have the option to save the image (File->Save Image)

  3. Common settings • File Output • Prefix • Image format • Resolution (e.g. 640x480, 72 dpi) • Frame range (for animations) • Camera (front, side, persp) • Aspect ration (HD)

  4. MAYA software settings

  5. Camera settings • In each view, there’s a camera icon • Can set options like: • Depth of field • Background color • Angle of view • Focal length • Near/Far clip plane

  6. Camera Settings

  7. Image Planes • Using an image as the background color • Image always faces the camera (orthogonal) • Can animate it, but doesn’t move if camera turns • Instead use a Skybox (or Sky Dome)

  8. Lighting • Several kinds of lights – hardest part of realism! • Default* – if no other lights, this one’s there (to the upper-left of camera) • Ambient – only affects ambient component of material • Directional light - parallel rays come from infinitely far away • Point* - a lamp • Spotlight* - a spotlight (duh!) • Area* – a rectangular light is the source (not just a point). Soft edged shadows • Volume – advanced. We won’t be using it here. • Global Illumination (Radiosity) – algorithm, not light. Patch-based. Mental Ray only. • Shadows – must turn them on per light and in render settings! * Attenuated (falls off with distance). Typically 1/d^2 http://krypton.fhda.edu/~bpuckett/gallery/doit_urself/Maya/Lights_and_Lighting

  9. Default Light(With raytracing and shadows turned on)

  10. Ambient light(with intensity at 1.000 to demonstrate it – Shadows Off)

  11. Directional Light • Has two parts (position and direction) • Separate with the ‘T’ key

  12. Directional light(Raytracing, Shadows on)

  13. Point light

  14. Spot light (2 parts)(Penumbra =5.0, cone angle=50.0, no decay)

  15. Area light (2 parts)

  16. About shadows • Two common kinds of shadows • Raytrace • Takes longer • Usually gives hard edges • Is exact • Shadow maps • Usually faster • Must specify resolution (default 512, which is bad) • Gives softer edges • Edges can be jagged

  17. About shadows 512 8192

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