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DMD 3D Cube animation (#p13715)Quote (./posting.php?mode=quote&f=26&p=13715)

(javascript:void(0);)Postby sinoptik » Sun Jan 11, 2015 8:23 am

(./download/file.php?id=340&mode=view)

Sketch for 3D cube animation.

Original code for OLED display (csconsulting thx) here:

http://forum.freetronics.com/viewtopic.php?f=37&t=5495

(http://forum.freetronics.com/viewtopic.php?f=37&t=5495)

For DMD:

http://youtu.be/d8XMuXJBqMs (http://youtu.be/d8XMuXJBqMs)

// 3D Cube sketch

// Draws a 3d rotating cube on the freetronics OLED screen. // Modified for DMD

#include <SPI.h> //SPI.h must be included as DMD is written by

SPI

#include <DMD.h>

#include <TimerOne.h>

//Fire up the DMD library as dmd

#define DISPLAYS_ACROSS 1

#define DISPLAYS_DOWN 2

DMD dmd(DISPLAYS_ACROSS, DISPLAYS_DOWN);

http://youtu.be/d8XMuXJBqMs




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http://forum.freetronics.com/posting.php?mode=quote&f=26&p=13715

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http://forum.freetronics.com/viewtopic.php?p=13715#p13715


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float xx,xy,xz;

float yx,yy,yz;

float zx,zy,zz;

int fadeAmount = 1;

float fact;

int Xan,Yan;

int Xoff;

int Yoff;

int Zoff;

int loops = 0;

boolean zoom = false;

struct Point3d

int x;

int y; int z;

;

struct Point2d

int x;

int y;

;

int LinestoRender; // lines to render.

int OldLinestoRender; // lines to render just in case it changes. this

makes sure the old lines all get erased.

struct Line3d

Point3d p0; Point3d p1;

;

struct Line2d

Point2d p0;

Point2d p1;

;

Line3d Lines[20];



Line2d Render[20];

Line2d ORender[20];

/***************************************************************************

// Sets the global vars for the 3d transform. Any points sent through

"process" will be transformed using these figures.

// only needs to be called if Xan or Yan are changed.

void SetVars(void)

float Xan2,Yan2,Zan2;

float s1,s2,s3,c1,c2,c3;

Xan2 = Xan / fact; // convert degrees to radians.

Yan2 = Yan / fact;

// Zan is assumed to be zero

s1 = sin(Yan2);

s2 = sin(Xan2);

c1 = cos(Yan2);

c2 = cos(Xan2);

xx = c1;

xy = 0;

xz = ‐s1;

yx = (s1 * s2);

yy = c2;

yz = (c1 * s2);

zx = (s1 * c2); zy = ‐s2;

zz = (c1 * c2);

/***************************************************************************

// processes x1,y1,z1 and returns rx1,ry1 transformed by the variables

set in SetVars()

// fairly heavy on floating point here.

// uses a bunch of global vars. Could be rewritten with a struct but not

worth the effort.

void ProcessLine(struct Line2d *ret,struct Line3d vec)



float zvt1;

int xv1,yv1,zv1;

float zvt2;

int xv2,yv2,zv2;

int rx1,ry1; int rx2,ry2;

int x1;

int y1;

int z1;

int x2;

int y2;

int z2;

int Ok;

x1=vec.p0.x;

y1=vec.p0.y;

z1=vec.p0.z;

x2=vec.p1.x;

y2=vec.p1.y;

z2=vec.p1.z;

Ok=0; // defaults to not OK

xv1 = (x1 * xx) + (y1 * xy) + (z1 * xz);

yv1 = (x1 * yx) + (y1 * yy) + (z1 * yz);

zv1 = (x1 * zx) + (y1 * zy) + (z1 * zz);

zvt1 = zv1 ‐ Zoff;

if( zvt1 < ‐5) rx1 = 256 * (xv1 / zvt1) + Xoff;

ry1 = 256 * (yv1 / zvt1) + Yoff;

Ok=1; // ok we are alright for point 1.

xv2 = (x2 * xx) + (y2 * xy) + (z2 * xz);

yv2 = (x2 * yx) + (y2 * yy) + (z2 * yz);

zv2 = (x2 * zx) + (y2 * zy) + (z2 * zz);

zvt2 = zv2 ‐ Zoff;



if( zvt2 < ‐5)

rx2 = 256 * (xv2 / zvt2) + Xoff;

ry2 = 256 * (yv2 / zvt2) + Yoff;

else

Ok=0;

if(Ok==1)

ret‐>p0.x=rx1;

ret‐>p0.y=ry1;

ret‐>p1.x=rx2; ret‐>p1.y=ry2;

// The ifs here are checks for out of bounds. needs a bit more code

here to "safe" lines that will be way out of whack, so they dont get drawn

and cause screen garbage.

/***************************************************************************

void ScanDMD()

dmd.scanDisplayBySPI();

void setup()

//initialize TimerOne's interrupt/CPU usage used to scan and refresh

the display

Timer1.initialize( 2500 ); //period in microseconds to call

ScanDMD. Anything longer than 5000 (5ms) and you can see flicker.

Timer1.attachInterrupt( ScanDMD ); //attach the Timer1 interrupt to

ScanDMD which goes to dmd.scanDisplayBySPI()

//clear/init the DMD pixels held in RAM

dmd.clearScreen( true ); //true is normal (all pixels off), false is

negative (all pixels on)



fact = 180 / 3.14159259; // conversion from degrees to radians.

Xoff = 16; // positions the center of the 3d conversion space into the

center of the OLED screen. This is usally screen_x_size / 2.

Yoff = 16*DISPLAYS_DOWN/2; // screen_y_size /2

Zoff = 500;

// line segments to draw a cube. basically p0 to p1. p1 to p2. p2 to

p3 so on.

// Front Face.

Lines[0].p0.x=‐15;

Lines[0].p0.y=‐15;

Lines[0].p0.z=15;

Lines[0].p1.x=15; Lines[0].p1.y=‐15;

Lines[0].p1.z=15;

Lines[1].p0.x=15;

Lines[1].p0.y=‐15;

Lines[1].p0.z=15;

Lines[1].p1.x=15;

Lines[1].p1.y=15; Lines[1].p1.z=15;

Lines[2].p0.x=15;

Lines[2].p0.y=15;

Lines[2].p0.z=15;

Lines[2].p1.x=‐15;

Lines[2].p1.y=15; Lines[2].p1.z=15;

Lines[3].p0.x=‐15;

Lines[3].p0.y=15;

Lines[3].p0.z=15;

Lines[3].p1.x=‐15;

Lines[3].p1.y=‐15;

Lines[3].p1.z=15;



//back face.

Lines[4].p0.x=‐15;

Lines[4].p0.y=‐15;

Lines[4].p0.z=‐15; Lines[4].p1.x=15;

Lines[4].p1.y=‐15;

Lines[4].p1.z=‐15;

Lines[5].p0.x=15;

Lines[5].p0.y=‐15;

Lines[5].p0.z=‐15;

Lines[5].p1.x=15; Lines[5].p1.y=15;

Lines[5].p1.z=‐15;

Lines[6].p0.x=15;

Lines[6].p0.y=15;

Lines[6].p0.z=‐15;

Lines[6].p1.x=‐15; Lines[6].p1.y=15;

Lines[6].p1.z=‐15;

Lines[7].p0.x=‐15;

Lines[7].p0.y=15;

Lines[7].p0.z=‐15;

Lines[7].p1.x=‐15;

Lines[7].p1.y=‐15; Lines[7].p1.z=‐15;

// now the 4 edge lines.

Lines[8].p0.x=‐15;

Lines[8].p0.y=‐15;

Lines[8].p0.z=15;

Lines[8].p1.x=‐15;

Lines[8].p1.y=‐15;

Lines[8].p1.z=‐15;



Lines[9].p0.x=15;

Lines[9].p0.y=‐15;

Lines[9].p0.z=15;

Lines[9].p1.x=15;

Lines[9].p1.y=‐15;

Lines[9].p1.z=‐15;

Lines[10].p0.x=‐15;

Lines[10].p0.y=15;

Lines[10].p0.z=15;

Lines[10].p1.x=‐15;

Lines[10].p1.y=15;

Lines[10].p1.z=‐15;

Lines[11].p0.x=15;

Lines[11].p0.y=15;

Lines[11].p0.z=15;

Lines[11].p1.x=15;

Lines[11].p1.y=15;

Lines[11].p1.z=‐15;

LinestoRender=12;

OldLinestoRender=LinestoRender;

/***************************************************************************

void RenderImage( void)

// renders all the lines after erasing the old ones.

// in here is the only code actually interfacing with the OLED. so if

you use a different lib, this is where to change it.

for (int i=0; i<OldLinestoRender; i++ )

dmd.drawLine(ORender[i].p0.x,ORender[i].p0.y,ORender[i].p1.x,ORender[i].p1.y

GRAPHICS_NOR); // erase the old lines.



for (int i=0; i<LinestoRender; i++ )

dmd.drawLine(Render[i].p0.x,Render[i].p0.y,Render[i].p1.x,Render[i].p1.y,

GRAPHICS_NORMAL);


void RenderInverse( void)

// renders all the lines after erasing the old ones.

// in here is the only code actually interfacing with the OLED. so if

you use a different lib, this is where to change it.

for (int i=0; i<OldLinestoRender; i++ )

dmd.drawLine(ORender[i].p0.x,ORender[i].p0.y,ORender[i].p1.x,ORender[i].p1.y

GRAPHICS_OR); // erase the old lines.

for (int i=0; i<LinestoRender; i++ )

dmd.drawLine(Render[i].p0.x,Render[i].p0.y,Render[i].p1.x,Render[i].p1.y,

GRAPHICS_INVERSE);


/***************************************************************************

void loop()

Xan++;

Yan++;



Yan=Yan % 360;

Xan=Xan % 360; // prevents overflow.

SetVars(); //sets up the global vars to do the conversion.

for(int i=0; i<LinestoRender ; i++)

ORender[i]=Render[i]; // stores the old line segment so we can

delete it later.

ProcessLine(&Render[i],Lines[i]); // converts the 3d line segments

to 2d.

if (loops < 2000)

RenderImage(); // go draw it!

if (loops > 2000)

RenderInverse(); // go draw it! zoom = true;

if (zoom)

Zoff = Zoff ‐ fadeAmount;

if (Zoff == 200 || Zoff == 800)

fadeAmount = ‐fadeAmount ;

loops++;

if (loops > 4000)

loops = 0;

/***************************************************************************

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Re: DMD 3D Cube animation (#p13733)Quote (./posting.php?mode=quote&f=26&p=13733)

(javascript:void(0);)Postby johnb » Wed Jan 14, 2015 6:29 am

Awesome ‐ thank you for sharing that with us!

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