NL3D::CLandscapeVegetableBlockCreateContext Class Reference

#include <landscape_vegetable_block.h>

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Detailed Description

Information for instanciation of vegetable IG. NB: there is one CLandscapeVegetableBlock per landscape TessBlock.

Author:

Lionel Berenguier

Nevrax France

Date:

2001

Definition at line 127 of file landscape_vegetable_block.h.

Public Member Functions
	CLandscapeVegetableBlockCreateContext ()
void	eval (uint ts, uint tt, float x, float y, CVector &pos)
void	init (CPatch *patch, uint ts, uint tt)
Private Attributes
bool	_Empty
CPatch *	_Patch
CVector	_Pos [9]
uint	_Ts
	Coordinate of the lower-left tile. 2x2 tile vegetables are generated.
uint	_Tt
	Coordinate of the lower-left tile. 2x2 tile vegetables are generated.

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Constructor & Destructor Documentation

NL3D::CLandscapeVegetableBlockCreateContext::CLandscapeVegetableBlockCreateContext (   )

Definition at line 277 of file landscape_vegetable_block.cpp. { _Patch= NULL; }

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Member Function Documentation

void NL3D::CLandscapeVegetableBlockCreateContext::eval (  uint  ts, uint  tt, float  x, float  y, CVector &  pos )

If Empty, create all the necessary information from patch. Then compute requested Pos, from the tile ts,tt, and pos in this tile. Parameters: ts,tt  coordinate of the tile. x,y  coordinate [0..1] in the tile. Definition at line 295 of file landscape_vegetable_block.cpp. References _Empty, NL3D::CPatch::computeVertex(), NL3D::CPatch::getOrderS(), NL3D::CPatch::getOrderT(), NL3D_TESSBLOCK_TILESIZE, nlassert, s, t, uint, x, and y. Referenced by NL3D::CPatch::generateTileVegetable(). { nlassert(NL3D_TESSBLOCK_TILESIZE==4); // If never created, do it now // ================== if(_Empty) { // Eval Position and normals for the 9 vertices (around the 2x2 tiles) for(uint j=0; j<3;j++) { float t= (float)(_Tt+j)/_Patch->getOrderT(); for(uint i=0; i<3;i++) { float s= (float)(_Ts+i)/_Patch->getOrderS(); // eval position. // use computeVertex() and not bpatch->eval() because vegetables must follow the // noise (at least at tile precision...). It is slower but necessary. _Pos[j*3+i]= _Patch->computeVertex(s, t); } } // Ok, it's done _Empty= false; } // Eval, with simple bilinear // ================== nlassert(ts==_Ts || ts==_Ts+1); nlassert(tt==_Tt || tt==_Tt+1); uint ds= ts-_Ts; uint dt= tt-_Tt; // Indices. uint v00= dt*3 + ds; uint v10= v00 + 1; uint v01= v00 + 3; uint v11= v00 + 4; // BiLinearFactor. float dxdy= (1-x)*(1-y); float dx2dy= x*(1-y); float dxdy2= (1-x)*y; float dx2dy2= x*y; // Compute Pos. pos = _Pos[v00] * dxdy; pos+= _Pos[v10] * dx2dy; pos+= _Pos[v01] * dxdy2; pos+= _Pos[v11] * dx2dy2; }

void NL3D::CLandscapeVegetableBlockCreateContext::init (  CPatch *  patch, uint  ts, uint  tt )

Definition at line 284 of file landscape_vegetable_block.cpp. References _Empty, nlassert, and uint. Referenced by NL3D::CLandscapeVegetableBlock::update(). { nlassert(patch); _Empty= true; _Patch= patch; _Ts= ts; _Tt= tt; }

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Field Documentation

bool NL3D::CLandscapeVegetableBlockCreateContext::_Empty [private]

Definition at line 144 of file landscape_vegetable_block.h. Referenced by eval(), and init().

CPatch* NL3D::CLandscapeVegetableBlockCreateContext::_Patch [private]

Definition at line 145 of file landscape_vegetable_block.h.

CVector NL3D::CLandscapeVegetableBlockCreateContext::_Pos[ 9 ] [private]

Definition at line 149 of file landscape_vegetable_block.h.

uint NL3D::CLandscapeVegetableBlockCreateContext::_Ts [private]

Coordinate of the lower-left tile. 2x2 tile vegetables are generated. Definition at line 147 of file landscape_vegetable_block.h.

uint NL3D::CLandscapeVegetableBlockCreateContext::_Tt [private]

Coordinate of the lower-left tile. 2x2 tile vegetables are generated. Definition at line 147 of file landscape_vegetable_block.h.

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

• landscape_vegetable_block.h
• landscape_vegetable_block.cpp

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