//?Bez3d.c
//?OpenGL?SuperBible?Chapter?13
//?Demonstrates?3D?Bezier?Surfaces
//?Program?by?Richard?S.?Wright?Jr.

#include?
#include?
#include?
#include?
#include?

//?The?number?of?control?points?for?this?curve
GLint?nNumPoints?=?3;

GLfloat?ctrlPoints[3][3][3]=?{{{??-4.0f?0.0f?4.0f}	
						??????{?-2.0f?4.0f?4.0f}	
							??{??4.0f?0.0f?4.0f?}}
							?
							??{{??-4.0f?0.0f?0.0f}	
						??????{?-2.0f?4.0f?0.0f}	
							??{??4.0f?0.0f?0.0f?}}
							??
							??{{??-4.0f?0.0f?-4.0f}	
						??????{?-2.0f?4.0f?-4.0f}	
							??{??4.0f?0.0f?-4.0f?}}};


//?This?function?is?used?to?superimpose?the?control?points?over?the?curve
void?DrawPoints（void）
	{
	int?ij;	//?Counting?variables

	//?Set?point?size?larger?to?make?more?visible
	glPointSize（5.0f）;

	//?Loop?through?all?control?points?for?this?example
	glBegin（GL_POINTS）;
		for（i?=?0;?i?			for（j?=?0;?j?				glVertex3fv（ctrlPoints[i][j]）;
	glEnd（）;
	}



//?Called?to?draw?scene
void?RenderScene（void）
	{
	//?Clear?the?window?with?current?clearing?color
	glClear（GL_COLOR_BUFFER_BIT）;

	//?Save?the?modelview?matrix?stack
	glMatrixMode（GL_MODELVIEW）;
	glPushMatrix（）;

	//?Rotate?the?mesh?around?to?make?it?easier?to?see
	glRotatef（45.0f?0.0f?1.0f?0.0f）;
	glRotatef（60.0f?1.0f?0.0f?0.0f）;

	//?Sets?up?the?Bezier
	//?This?actually?only?needs?to?be?called?once?and?could?go?in
	//?the?setup?function
	glMap2f（GL_MAP2_VERTEX_3	//?Type?of?data?generated
	0.0f						//?Lower?u?range
	10.0f						//?Upper?u?range
	3							//?Distance?between?points?in?the?data
	3							//?Dimension?in?u?direction?（order）
	0.0f						//?Lover?v?range
	10.0f						//?Upper?v?range
	9							//?Distance?between?points?in?the?data
	3							//?Dimension?in?v?direction?（order）
	&ctrlPoints[0][0][0]）;		//?array?of?control?points

	//?Enable?the?evaluator
	glEnable（GL_MAP2_VERTEX_3）;

	//?Use?higher?level?functions?to?map?to?a?grid?then?evaluate?the
	//?entire?thing.

	//?Map?a?grid?of?10?points?from?0?to?10
	glMapGrid2f（100.0f10.0f100.0f10.0f）;

	//?Evaluate?the?grid?using?lines
	glEvalMesh2（GL_LINE010010）;

	//?Draw?the?Control?Points
	DrawPoints（）;

	//?Restore?the?modelview?matrix
	glPopMatrix（）;

	//?Dispalay?the?image
	glutSwapBuffers（）;
	}

//?This?function?does?any?needed?initialization?on?the?rendering
//?context.?
void?SetupRC（）
	{
	//?Clear?Window?to?white
	glClearColor（1.0f?1.0f?1.0f?1.0f?）;

	//?Draw?in?Blue
	glColor3f（0.0f?0.0f?1.0f）;	}


void?ChangeSize（int?w?int?h）
	{
	//?Prevent?a?divide?by?zero
	if（h?==?0）
		h?=?1;

	//?Set?Viewport?to?window?dimensions
????glViewport（0?0?w?h）;
	glMatrixMode（GL_PROJECTION）;
	glLoadIdentity（）;

	glOrtho（-10.0f?10.0f?-10.0f?10.0f?-10.0f?10.0f）;

	//?Modelview?matrix?reset
	glMatrixMode（GL_MODELVIEW）;
	glLoadIdentity（）;
	}

int?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????3272??1999-09-04?09:21??Bez3d\Bez3d.c

?????文件???????4064??1999-09-04?00:44??Bez3d\Bez3d.dsp

?????文件????????533??1999-09-04?00:38??Bez3d\Bez3d.dsw

?????文件??????32768??1999-09-04?09:21??Bez3d\Bez3d.exe

?????文件??????57856??1999-09-04?09:22??Bez3d\Bez3d.opt

?????文件???????1003??1999-09-04?09:21??Bez3d\Bez3d.plg

?????目錄??????????0??2010-03-05?09:58??Bez3d

-----------?---------??----------?-----??----

????????????????99496????????????????????7