8-Illumination

8-Illumination - Illumination Jason Lawrence CS 4810:...

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Unformatted text preview: Illumination Jason Lawrence CS 4810: Graphics Acknowledgment: slides by Misha Kazhdan, Allison Klein, Tom Funkhouser, Adam Finkelstein and David Dobkin Overview Direct Illumination o Emission at light sources o Direct light at surface points Global illumination o Shadows o Inter-object reFections o Transmissions Refractive Bouncing Overview Direct Illumination o Emission at light sources o Direct light at surface points Global illumination o Shadows o Inter-object reFections o Transmissions Intersection Testing Overview Direct Illumination o Emission at light sources o Direct light at surface points Global illumination o Shadows o Inter-object reFections o Transmissions Modeling Light Sources I L ( x,y,z, , , ) ... o describes the intensity of energy, o leaving a light source, o arriving at location(x,y,z), ... o from direction ( , ), ... o with wavelength (x,y,z) Light Empirical Models Ideally measure irradiant energy for all situations o Too much storage o DifFcult in practice Simplifed Light Source Models Simple mathematical models: o Point light o Directional light o Spot light Point Light Source Models omni-directional point source o intensity (I ), o position (px, py, pz), o factors (k c , k l , k q ) for attenuation with distance (d) d Light (px, py, pz) Directional Light Source Models point light source at infnity o intensity (I ), o direction (dx,dy,dz) (dx, dy, dz) No attenuation with distance Spot Light Source Models point light source with direction o intensity (I ), o position (px, py, pz), o attenuation (k c , k l , k q ) o direction (dx, dy, dz) o cut-off and drop-off ( , ) d Light (px, py, pz) D L How can we modify point light to decrease as increases? Spot Light Source Models point light source with direction o intensity (I ), o position (px, py, pz), o attenuation (k c , k l , k q ) o direction (dx, dy, dz) o cut-off and drop-off ( , ) d Light (px, py, pz) D L Overview Direct Illumination o Emission at light sources o Direct light at surface points Global illumination o Shadows o Transmissions o Inter-object reFections Overview Direct Illumination o Emission at light sources o Direct light at surface points Global illumination o Shadows o Transmissions o Inter-object reFections Modeling Surface ReFectance R s ( , , , , ) ... o describes the fraction of incident energy, o arriving from direction ( , ), ... o with wavelength , ... o leaving in direction ( , ), Surface ( , ) ( , ) Empirical Models Ideally measure radiant energy for all combinations of incident angles o Too much storage o DifFcult in practice Surface ( , ) ( , ) Simple Refectance Model Simple analytic model: o diffuse reFection + o specular reFection + o emission + o ambient Surface Based on model proposed by Phong Simple Refectance Model Simple analytic model:...
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This note was uploaded on 03/21/2010 for the course CS 4810 taught by Professor Lawrence during the Spring '10 term at UVA.

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8-Illumination - Illumination Jason Lawrence CS 4810:...

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