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Code Issues 122 Wiki Activity

view range factor implementation

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This commit is contained in:
tmj-fstate
2017-03-08 01:25:09 +01:00
parent 2f3e916d9e
commit 6526620364
8 changed files with 56 additions and 81 deletions
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27
skydome.cpp
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@@ -2,6 +2,7 @@
#include "stdafx.h"
#include "skydome.h"
#include "color.h"
#include "usefull.h"
// sky gradient based on "A practical analytic model for daylight"
// by A. J. Preetham Peter Shirley Brian Smits (University of Utah)
@@ -41,21 +42,6 @@ float CSkyDome::m_zenithymatrix[ 3 ][ 4 ] = {
//******************************************************************************//
float clamp( float const Value, float const Min, float const Max ) {
float value = Value;
if( value < Min ) { value = Min; }
if( value > Max ) { value = Max; }
return value;
}
float interpolate( float const First, float const Second, float const Factor ) {
return ( First * ( 1.0f - Factor ) ) + ( Second * Factor );
}
//******************************************************************************//
CSkyDome::CSkyDome (int const Tesselation) :
m_tesselation( Tesselation ) {
@@ -121,8 +107,6 @@ void CSkyDome::Generate() {
}
}
//******************************************************************************//
void CSkyDome::Update( Math3D::vector3 const &Sun ) {
if( true == SetSunPosition( Sun ) ) {
@@ -166,8 +150,6 @@ void CSkyDome::Render() {
::glDisableClientState( GL_VERTEX_ARRAY );
}
//******************************************************************************//
bool CSkyDome::SetSunPosition( Math3D::vector3 const &Direction ) {
auto sundirection = SafeNormalize( float3( Direction.x, Direction.y, Direction.z) );
@@ -205,8 +187,6 @@ void CSkyDome::SetOvercastFactor( float const Overcast ) {
m_overcast = clamp( Overcast, 0.0f, 1.0f );
}
//******************************************************************************//
void CSkyDome::GetPerez( float *Perez, float Distribution[ 5 ][ 2 ], const float Turbidity ) {
Perez[ 0 ] = Distribution[ 0 ][ 0 ] * Turbidity + Distribution[ 0 ][ 1 ];
@@ -227,8 +207,6 @@ float CSkyDome::GetZenith( float Zenithmatrix[ 3 ][ 4 ], const float Theta, cons
}
//******************************************************************************//
float CSkyDome::PerezFunctionO1( float Perezcoeffs[ 5 ], const float Thetasun, const float Zenithval ) {
const float val = ( 1.0f + Perezcoeffs[ 0 ] * std::exp( Perezcoeffs[ 1 ] ) ) *
@@ -244,7 +222,6 @@ float CSkyDome::PerezFunctionO2( float Perezcoeffs[ 5 ], const float Icostheta,
( 1.0f + Perezcoeffs[ 2 ] * std::exp( Perezcoeffs[ 3 ] * Gamma ) + Perezcoeffs[ 4 ] * Cosgamma2 );
}
//******************************************************************************//
void CSkyDome::RebuildColors() {
// get zenith luminance
@@ -320,7 +297,7 @@ void CSkyDome::RebuildColors() {
// override the hue, based on sun height above the horizon. crude way to deal with model shortcomings
// correction begins when the sun is higher than 10 degrees above the horizon, and fully in effect at 10+15 degrees
auto const degreesabovehorizon = 90.0f - m_thetasun * ( 180.0f / M_PI );
float const degreesabovehorizon = 90.0f - m_thetasun * ( 180.0f / M_PI );
auto const sunbasedphase = clamp( (1.0f / 15.0f) * ( degreesabovehorizon - 10.0f ), 0.0f, 1.0f );
// correction is applied in linear manner from the bottom, becomes fully in effect for vertices with y = 0.50
auto const heightbasedphase = clamp( vertex.y * 2.0f, 0.0f, 1.0f );