Sisätilan valaistuksen simulointi VIZ-ohjelmalla

Abstract

Tämä opinnäytetyö käsittelee valaistussimulaation tekemistä Autodesk® VIZ 2007 -ohjelman avulla. VIZ on 3d-mallinnusohjelma, jossa geometrian, pintamateriaalien ja valonlähteiden ominaisuudet voidaan määritellä fysikaalisilla arvoilla. Näi-den fysikaalisten arvojen perusteella VIZ-ohjelman radiositeettilaskenta simuloi epäsuoraa valaistusta.;Työn yhteydessä tutkittiin aidon valon ominaisuuksia ja käyttäytymistä eri tilanteissa. Tutkittuja aidon valon ominaisuuksia verrattiin VIZ-ohjelman fotometristen valojen ominaisuuksiin. Aidon valon käyttäytymistä aineiden rajapinnoissa verrat-tiin VIZ-ohjelman arkkitehtuurimateriaalien tapaan heijastaa ja taittaa valoa. Radiositeettilaskennan ominaisuuksia tutkimalla selvitettiin VIZ-ohjelman keinoja epäsuoran valaistuksen laskemiseen.

This thesis deals with lighting simulation using Autodesk® VIZ 2007 software. VIZ is a 3D modeling software in which the properties of geometry, materials and lights can be determined using real physical values. These physical values are used in the radiosity calculations of VIZ to simulate indirect lighting.;The properties and behavior of real light in various situations were examined. These real light properties were compared with the properties of the photometric lights of the VIZ software. The behavior of real light on the boundary surface of materials was compared with the way the architectural materials of VIZ reflect and refract light. VIZ software's ways of calculating indirect lighting were examined by studying the properties of radiosity.;The comparisons showed that the properties used for the lighting simulation for both the photometric lights and the architectural materials of the VIZ software were based on real physical values. The accuracy of the radiosity solution was tested in the case part of the thesis.;In the case part, real lighting and simulated lighting were compared experimentally. A highly detailed 3D model of a real room was constructed for the experiment. The model was built using architectural materials and photometric lights whose properties were set up using the corresponding properties of the real room. The lighting simulation was done with radiosity. After the simulation the illuminance of the 3D model was measured from various positions using the lighting analysis tool. The same positions were measured in the real room using a lux meter. In addition, the real room and its 3D model were compared visually based on their photographs and renderings.;Simulated and real illumination values differed from each other depending on what lamps were used in the lighting. Based on the differences, it seems that the properties of the architectural materials had been set up incorrectly. A more reliable lighting simulation test would require the use of a spectrophotometer, which measures the reflectance and transmittance values of the surfaces more accurately.