NL3D::CHeatHaze Class Reference

#include <heat_haze.h>

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Detailed Description

This perform a heat haze effect at the horizon of the scene. This make use of 2d deformation of the frame buffer

Parameters:

width	: viewport width
height	: viewport height

Author:

Nicolas Vizerie

Nevrax France

Date:

2001

Definition at line 47 of file heat_haze.h.

Static Public Member Functions
void	performHeatHaze (uint width, uint height, CScene &s, IDriver *drv)

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Member Function Documentation

void NL3D::CHeatHaze::performHeatHaze (  uint  width, uint  height, CScene &  s, IDriver *  drv )  [static]

Definition at line 51 of file heat_haze.cpp. References NL3D::_SinWave, NLMISC::CPlane::a, NLMISC::CPlane::c, NLMISC::CPlane::d, height, NLMISC::CMatrix::inverted(), NLMISC::CPlane::make(), NLMISC::CVector::normalize(), s, NLMISC::CVector::set(), sint, uint, width, NLMISC::CVector::x, and NLMISC::CVector::z. { NLMISC::CMatrix m = s.getCam()->getMatrix(); NLMISC::CMatrix im = m.inverted(); // compute the shape of the horizon // first we compute the direction of the world up vector in the viewer basis. NLMISC::CVector up = im * NLMISC::CVector::K; // project onto the I and K vectors float upNorm = (up.x * up.x + up.z * up.z); const float threshold = 10E-4f; if (upNorm < threshold) return; // the viewer is looking above or below himlself // Compute the right vector. This is done by intersecting the horizon plane with a near plane. // to do this, we transform the horizon plane into the view basis.This may be optimized, but is not critical. // NLMISC::CPlane h; h.make(NLMISC::CVector::K, NLMISC::CVector::Null); h = h * m; // note : this multiply by the transposition of m // intersect with near plane : we got y = 0, which gives us, as a right vector : // if c is not 0, we got : x = 1 and z = (-a - d) / c as a working solution. // Else we got x = (- d - c )/ a and z = 1 NLMISC::CVector right; if (fabsf(h.c) > threshold) { right.set(1, 0, (h.a + h.d) / - h.c ); } else { right.set( (h.d + h.c) / h.a, 0, 1); } right.normalize(); // now, find a point on screen that lay on the horizon line static std::vector<NLMISC::CVector2f> poly(4); const sint xCenter = width >> 1; const sint yCenter = height >> 1; const float horizonHeight = (float) (height >> 2); const float horizonWidth = (float) (width >> 2); NLMISC::CVector tmp ; tmp = horizonWidth * right + horizonHeight * up; poly[0] = NLMISC::CVector2f(xCenter + tmp.x, yCenter + tmp.z) ; tmp = horizonWidth * right - horizonHeight * up; poly[1] = NLMISC::CVector2f(xCenter + tmp.x, yCenter + tmp.z) ; tmp = - horizonWidth * right - horizonHeight * up; poly[2] = NLMISC::CVector2f(xCenter + tmp.x, yCenter + tmp.z); tmp = - horizonWidth * right + horizonHeight * up; poly[3] = NLMISC::CVector2f(xCenter + tmp.x, yCenter + tmp.z); CDeform2d::doDeform(poly, drv, &_SinWave); }

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The documentation for this class was generated from the following files:

• heat_haze.h
• heat_haze.cpp

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