Volumizer: C:/Users/thebigMuh/Documents/Visual Studio 2005/Projects/Volumizer/Volumizer/RayEngine.cpp File Reference

#define TOOL_HEIGHT 36

float bias	(	float	_val,
		float	_bias
	)

Schlick bias function. A bit like gamma, but cooler :P

Definition at line 144 of file RayEngine.cpp.

Referenced by OogleVal().

void DrawRect	(	int	x,
		int	y,
		int	height,
		int	width,
		color	c,
		int	size,
		color *	fbuffer
	)

where the stuff should end up

Fill a rectangular area of pixels with a given color value.

Parameters:

height	x and y position of lower left corner
c	x and y extents of the whole image
fbuffer	color and size of the box

Definition at line 671 of file RayEngine.cpp.

Referenced by RayRender().

float gain	(	float	_val,
		float	_gain
	)

Schlick gain function.

Definition at line 152 of file RayEngine.cpp.

Referenced by OogleVal().

static __inline int GetBoxIntersection	(	vect &	vnear,
		vect &	vfar,
		vect &	org,
		vect &	dir
	)			`[static]`

Take the ray defined by org and dir, and intersect it with an axis aligned box described by the two corners (0, 0, 0) and (volx, voly, volz). Return the two intersection points along the ray in vnear and vfar.

set near and far distance to something huge

intersect with x-planes the if () at the start makes sure the test only happens when the ray isn't parallel to the plane

Parameters:

vfar	near intersection with ray (out)
org	far intersection with ray (out)
dir	ray origin ray direction

Definition at line 237 of file RayEngine.cpp.

References volx, voly, and volz.

Referenced by ShootRay().

static __inline vect GetGradient	(	vect	pos,
		float	base
	)			`[static]`

Compute the (inverted) gradient at position pos, based on the value base. Don't normalize it!

Parameters:

base

current position value at the current position

Definition at line 456 of file RayEngine.cpp.

References GetInterpolatedSample(), and vol_opts.

Referenced by ShadeStep().

static __inline float GetInterpolatedSample ( vect pos ) [static]

Get the trilinearly interpolated sample at pos.

get the position inside the current cell [0...1]

get the lower left back corner of the cell

make sure we don't fall outside the valid coordinates

interpolate along z

interpolate along y

interpolate along x

Definition at line 187 of file RayEngine.cpp.

References GetSample(), volx, voly, and volz.

Referenced by GetGradient(), ShadeStep(), and ShootRay().

static __inline float GetRand01 ( ) [static]

Return a random number between 0 and 1.

Definition at line 447 of file RayEngine.cpp.

Referenced by ShootRay().

static __inline float GetSample	(	int	x,
		int	y,
		int	z
	)			`[static]`

Grab the sample at position x, y, z

Definition at line 179 of file RayEngine.cpp.

References voldat, volx, and voly.

Referenced by GetInterpolatedSample().

void LoadDataFile ( wchar_t * fileName )

Read a volume data file from disc and store it into rawdat.

open input file handle

read x y and z size

kill an old voldat if it's there

create new array

create array for reading data in

read all records at once

find the maximum

close input file

set the average x, y and z slize

initialize our camera and light

shovel data into float array

Definition at line 91 of file RayEngine.cpp.

References InitCam(), InitLight(), rawdat, rawmax, ShovelData(), voldat, volx, voly, volz, xslice, yslice, and zslice.

Referenced by GetOpenFile().

static __inline float OogleVal ( float inp ) [static]

Apply bias, gain and gamma to an input value

Definition at line 167 of file RayEngine.cpp.

References bias(), brightness, contrast, gain(), and gamma.

Referenced by ShovelData().

INT_PTR CALLBACK ProgressProc	(	HWND	hwndDlg,
		UINT	uMsg,
		WPARAM	wParam,
		LPARAM	lParam
	)

Window Procedure for the little "Progress" popup after loading. Nothing amazing.

Definition at line 22 of file RayEngine.cpp.

Referenced by ShovelData().

void RayRender ( )

The main render function. Render pretty pictures!

first, create a new frame buffer

take the camera info, compute a view grill to shoot our rays through

do the whole rendering loop several times, in a progressive loop

only shoot for those rays that fit the current refinement step

calculate the ray direction

shoot a ray, and fill a whole area of pixels with whatever comes back

every few lines, blit the stuff out onto the screen

make sure to peek for messages every now and then, so the render can actually be cancelled

blit the final image out

Definition at line 689 of file RayEngine.cpp.

References cam, DrawRect(), rayHdc, rayHglrc, ShootRay(), wnd_3d, and wnd_main.

Referenced by EditTransferHandle(), HistogramProc(), OptionsProc(), RayProc(), and ShovelData().

bool ShadeStep	(	vect &	dir,
		vect &	pos,
		color &	col,
		float	steplen
	)

Shade a step along the current ray.

break off if the contribution is less than 1 percent

get the current sample value

also grab the gradient at that position

only normalize if the gradient is actually there

get an interpolated material

scale our transparency with the gradient (if wanted), and the step length

start by placing the ambient color into our output

compute diffuse coefficient

compute specular component (simple phong)

finally, comp it into the color

Parameters:

pos	view direction
col	position
steplen	in/output color length of the step (for scaling transparency)

Definition at line 479 of file RayEngine.cpp.

References CreateInterpolatedHandle(), GetGradient(), GetInterpolatedSample(), and ldir.

Referenced by ShootRay().

color ShootRay	(	vect	org,
		vect	dir
	)

Shoot a ray into our scene. Return whatever color info we get.

if nsects is zero, we don't hit the volume box

if nsects is 1 we are inside the box, looking out.

if we are shading fully, do this

else, we want MIP

Parameters:

dir

ray start ray direction

Definition at line 578 of file RayEngine.cpp.

References CreateInterpolatedHandle(), GetBoxIntersection(), GetInterpolatedSample(), GetRand01(), ShadeStep(), and vol_opts.

Referenced by RayRender().

void ShovelData ( )

Take the raw data, normalize it to [0, 1], treat it with bias/gain/gamma, and put it into voldat.

create progress box

and show it

grab progress bar id

setup the progress bar extent

rebuild all three slices

kill progress bar

rebuild the histogram

and render it

Definition at line 31 of file RayEngine.cpp.

References BuildOrthoSlice(), CalcHistogram(), DrawHistogram(), DrawOrtho(), hInst, IDC_PROGRESS, IDD_PROGRESS, OogleVal(), ProgressProc(), rawdat, rawmax, RayRender(), voldat, volx, voly, volz, wnd_front, wnd_histogram, wnd_left, wnd_main, and wnd_top.

Referenced by LoadDataFile(), and ToolBarProc().

camera cam

Definition at line 12 of file RayWnd.cpp.

Referenced by DrawRay(), InitCam(), RayProc(), and RayRender().

vect ldir

the camera

Definition at line 13 of file RayWnd.cpp.

Referenced by DrawLight(), InitLight(), RayProc(), and ShadeStep().

unsigned short* rawdat

RayEngine.cpp

Implements all the heavy lifting

Definition at line 9 of file RayEngine.cpp.

Referenced by LoadDataFile(), and ShovelData().

unsigned short rawmax

Definition at line 9 of file RayEngine.cpp.

Referenced by LoadDataFile(), and ShovelData().

HDC rayHdc

RayWnd.cpp

Implements the raycasting volume view

Definition at line 9 of file RayWnd.cpp.

Referenced by DeInitRay(), DrawRay(), InitRay(), and RayRender().

HGLRC rayHglrc

Definition at line 10 of file RayWnd.cpp.

Referenced by DeInitRay(), DrawRay(), InitRay(), and RayRender().

float* voldat

raw volume data

Definition at line 10 of file RayEngine.cpp.

Referenced by BuildOrthoSlice(), CalcHistogram(), DrawOrtho(), GetSample(), LoadDataFile(), OrthoProc(), and ShovelData().

unsigned int volx

normalized and treated volume data

Definition at line 11 of file RayEngine.cpp.

Referenced by BuildOrthoSlice(), CalcHistogram(), DrawGrid(), DrawOrtho(), GetBoxIntersection(), GetInterpolatedSample(), GetSample(), InitCam(), LoadDataFile(), MoveHandle(), ShiftSlice(), and ShovelData().

unsigned int voly

Definition at line 11 of file RayEngine.cpp.

Referenced by BuildOrthoSlice(), CalcHistogram(), DrawGrid(), DrawOrtho(), GetBoxIntersection(), GetInterpolatedSample(), GetSample(), InitCam(), LoadDataFile(), MoveHandle(), ShiftSlice(), and ShovelData().

unsigned int volz

Definition at line 11 of file RayEngine.cpp.

Referenced by BuildOrthoSlice(), CalcHistogram(), DrawGrid(), DrawOrtho(), GetBoxIntersection(), GetInterpolatedSample(), InitCam(), LoadDataFile(), MoveHandle(), ShiftSlice(), and ShovelData().

HWND wnd_main

x, y and z size of the data

Definition at line 16 of file Volumizer.cpp.

Referenced by _tWinMain(), GetOpenFile(), InitInstance(), RayRender(), ShovelData(), and SplitterProc().

C:/Users/thebigMuh/Documents/Visual Studio 2005/Projects/Volumizer/Volumizer/RayEngine.cpp File Reference

Defines

Functions

Variables

Define Documentation

Function Documentation

Variable Documentation


Defines
#define	TOOL_HEIGHT 36
Functions
INT_PTR CALLBACK	ProgressProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
void	ShovelData ()
void	LoadDataFile (wchar_t *fileName)
float	bias (float _val, float _bias)
float	gain (float _val, float _gain)
static __inline float	OogleVal (float inp)
static __inline float	GetSample (int x, int y, int z)
static __inline float	GetInterpolatedSample (vect pos)
static __inline int	GetBoxIntersection (vect &vnear, vect &vfar, vect &org, vect &dir)
static __inline float	GetRand01 ()
static __inline vect	GetGradient (vect pos, float base)
bool	ShadeStep (vect &dir, vect &pos, color &col, float steplen)
color	ShootRay (vect org, vect dir)
void	DrawRect (int x, int y, int height, int width, color c, int size, color *fbuffer)
	where the stuff should end up
void	RayRender ()
Variables
unsigned short *	rawdat
unsigned short	rawmax
float *	voldat
	raw volume data
unsigned int	volx
	normalized and treated volume data
unsigned int	voly
unsigned int	volz
HWND	wnd_main
	x, y and z size of the data
camera	cam
HDC	rayHdc
HGLRC	rayHglrc
vect	ldir
	the camera