From 7e7791755a768d63b595aa65f3a1621fd94226fd Mon Sep 17 00:00:00 2001 From: Hamed Zaghaghi Date: Thu, 3 Jul 2008 10:38:35 +0000 Subject: Sun,Sky and atmosphere for lamps(sun type), PATCH#8063 http://projects.blender.org/tracker/?func=detail&atid=127&aid=8063&group_id=9 --- source/blender/render/intern/include/sunsky.h | 141 ++++++++++++++++++++++++++ 1 file changed, 141 insertions(+) create mode 100644 source/blender/render/intern/include/sunsky.h (limited to 'source/blender/render/intern/include/sunsky.h') diff --git a/source/blender/render/intern/include/sunsky.h b/source/blender/render/intern/include/sunsky.h new file mode 100644 index 00000000000..c61a637269a --- /dev/null +++ b/source/blender/render/intern/include/sunsky.h @@ -0,0 +1,141 @@ + /** + * ***** BEGIN GPL LICENSE BLOCK ***** + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Contributor(s): zaghaghi + * + * ***** END GPL LICENSE BLOCK ***** + */ +/** + * This feature comes from Preetham paper on "A Practical Analytic Model for Daylight" + * and example code from Brian Smits, another author of that paper in + * http://www.cs.utah.edu/vissim/papers/sunsky/code/ + * */ +#ifndef SUNSKY_H_ +#define SUNSKY_H_ + +#define SPECTRUM_MAX_COMPONENTS 100 +#define SPECTRUM_START 350.0 +#define SPECTRUM_END 800.0 + +typedef struct SunSky +{ + short effect_type; + float turbidity; + float theta, phi; + + float toSun[3]; + + /*float sunSpectralRaddata[SPECTRUM_MAX_COMPONENTS];*/ + float sunSolidAngle; + + float zenith_Y, zenith_x, zenith_y; + + float perez_Y[5], perez_x[5], perez_y[5]; + + /* suggested by glome in + * http://projects.blender.org/tracker/?func=detail&atid=127&aid=8063&group_id=9*/ + float horizon_brightness; + float spread; + float sun_brightness; + float sun_size; + float backscattered_light; + + float atm_HGg; + + float atm_SunIntensity; + float atm_InscatteringMultiplier; + float atm_ExtinctionMultiplier; + float atm_BetaRayMultiplier; + float atm_BetaMieMultiplier; + float atm_DistanceMultiplier; + + float atm_BetaRay[3]; + float atm_BetaDashRay[3]; + float atm_BetaMie[3]; + float atm_BetaDashMie[3]; + float atm_BetaRM[3]; +}SunSky; + +/** + * InitSunSky: + * this function compute some sun,sky parameters according to input parameters and also initiate some other sun, sky parameters + * parameters: + * sunSky, is a structure that contains informtion about sun, sky and atmosphere, in this function, most of its values initiated + * turb, is atmosphere turbidity + * toSun, contains sun direction + * horizon_brighness, controls the brightness of the horizon colors + * spread, controls colors spreed at horizon + * sun_brightness, controls sun's brightness + * sun_size, controls sun's size + * back_scatter, controls back scatter light + * */ +void InitSunSky(struct SunSky *sunsky, float turb, float *toSun, float horizon_brightness, + float spread,float sun_brightness, float sun_size, float back_scatter); + +/** + * GetSkyXYZRadiance: + * this function compute sky radiance according to a view parameters `theta' and `phi'and sunSky values + * parameters: + * sunSky, sontains sun and sky parameters + * theta, is sun's theta + * phi, is sun's phi + * color_out, is computed color that shows sky radiance in XYZ color format + * */ +void GetSkyXYZRadiance(struct SunSky* sunsky, float theta, float phi, float color_out[3]); + +/** + * GetSkyXYZRadiancef: + * this function compute sky radiance according to a view direction `varg' and sunSky values + * parameters: + * sunSky, sontains sun and sky parameters + * varg, shows direction + * color_out, is computed color that shows sky radiance in XYZ color format + * */ +void GetSkyXYZRadiancef(struct SunSky* sunsky, const float varg[3], float color_out[3]); + +/** + * InitAtmosphere: + * this function intiate sunSky structure with user input parameters. + * parameters: + * sunSky, contains information about sun, and in this function some atmosphere parameters will initiated + * sun_intens, shows sun intensity value + * mief, Mie scattering factor this factor currently call with 1.0 + * rayf, Rayleigh scattering factor, this factor currently call with 1.0 + * inscattf, inscatter light factor that range from 0.0 to 1.0, 0.0 means no inscatter light and 1.0 means full inscatter light + * extincf, extinction light factor that range from 0.0 to 1.0, 0.0 means no extinction and 1.0 means full extinction + * disf, is distance factor, multiplyed to pixle's z value to compute each pixle's distance to camera, + * */ +void InitAtmosphere(struct SunSky *sunSky, float sun_intens, float mief, float rayf, float inscattf, float extincf, float disf); + +/** + * AtmospherePixleShader: + * this function apply atmosphere effect on a pixle color `rgb' at distance `s' + * parameters: + * sunSky, contains information about sun parameters and user values + * view, is camera view vector + * s, is distance + * rgb, contains rendered color value for a pixle + * */ +void AtmospherePixleShader( struct SunSky* sunSky, float view[3], float s, float rgb[3]); + +/** + * ClipColor: + * clip a color to range [0,1]; + * */ +void ClipColor(float c[3]); + +#endif /*SUNSKY_H_*/ -- cgit v1.2.3