Environment Mapping. Overview

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Mervin Carr
6 years ago
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1 Envionment Mapping 1 Oveview Intoduction Envionment map constuction sphee mapping Envionment mapping applications distant geomety eflections 2 1

2 Oveview Intoduction Envionment map constuction sphee mapping Envionment mapping applications distant geomety eflections 3 Intoduction Envionment map an image with a lage FOV: panoama a collection of ays that pass though one point it could cove all possible view diections seveal types, accoding to how the ays sample the solid angle Applications distant geomety fast (appoximate) eflections 4 2

3 Oveview Intoduction Envionment map constuction spheic mapping Envionment mapping applications distant geomety eflections 5 Oveview Intoduction Envionment map constuction sphee mapping Envionment mapping applications distant geomety eflections 6 3

undistot each constuction image egiste images in common coodinate system build cube map fo evey pixel of evey face ( fo

4 Cube mapping 6 x 90 o x90 o images same COP fames fom 6 faces of a cube 7 Cube mapping constuction By endeing ende scene fo each of the 6 faces Acquisition using camea take ovelapping pictues by otating camea aound COP (constuction images) undistot each constuction image egiste images in common coodinate system build cube map fo evey pixel of evey face ( fo each ay in the panoama ) poject on each constuction image blend colos fom all constuction images that had the cuent ay 8 4

5 Cube mapping Simple math fo constuction and lookup Faily unifom sampling 6 sepaate images that need to be acquied, stoed and pocessed 9 Sphee mapping The image of a small shiny sphee seen fom fa away Incoming ays ae paallel Coves all diections Sampling vaies consideably 10 5

6 Acquisition using camea 11 Acquisition using camea 12 6

7 Acquisition using camea 13 Acquisition using camea 14 7

8 Sphee mapping Moe expensive math fo constuction and lookup Non-unifom sampling Can be acquied with one photo but camea visible in the map light pobe does not float in mid ai 15 Oveview Intoduction Envionment map constuction sphee mapping Envionment mapping applications distant geomety eflections 16 8

9 Oveview Intoduction Envionment map constuction sphee mapping Envionment mapping applications distant geomety eflections 17 Rendeing distant geomety ( envionment ) Envionment map stoes distant geomety as seen fom the cente of the scene (EM) clouds, mountains, moon, stas, sun etc. Instead of cleaing the fame buffe, set it to the appopiate pat of the envionment look up each desied ay in the env. map as if the envionment map was taken fom the cuent position of the camea (D) assumption valid because distance to envionment much geate than distance fom cente of scene (EM) to cuent position (D) D EM 18 9

10 Efficient (but appoximate) eflections Acquie (ende o captue) the envionment map fom the cente C of the eflecto Run time algoithm if scene changed e-ende envionment map fo each eflecto fo each tiangle fo each visible inside pixel» compute nomal (n)» compute eye vecto (e)» compute eflected ay ()» look it up in the env. map () D e C n 19 Limitations Incoect eflections A instead of B No motion paallax No inte-eflections No multiple eflections D e n B A 20 10

11 Limitations Incoect eflections No motion paallax endeed image always: C, B, A coect: C, A (B hidden) coect (not shown): B, C, A No inte-eflections No multiple eflections D e n C B A 21 Limitations Incoect eflections No motion paallax No inte-eflections No multiple eflections e n D 22 11

Goal. Rendering Complex Scenes on Mobile Terminals or on the web. Rendering on Mobile Terminals. Rendering on Mobile Terminals. Walking through images

Goal. Rendering Complex Scenes on Mobile Terminals or on the web. Rendering on Mobile Terminals. Rendering on Mobile Terminals. Walking through images Goal Walking though s -------------------------------------------- Kadi Bouatouch IRISA Univesité de Rennes I, Fance Rendeing Comple Scenes on Mobile Teminals o on the web Rendeing on Mobile Teminals Rendeing