Viewing Program

Program Data

Program thumbnail for "{props.program.title}"

Title	plane
ID	2374761735
Created	12 years ago, 1383241817208
Updated	12 years ago, 1383352731738
Code	/var v0x=0, v0y=0, v0z=1, v1x=1, v1y=0, v1z=0, v2x=0, v2y=1, v2z=0;/ frameRate(24); //var gsiz=200; var tex=[]; //var fps=24; draw= function() { background(255); if(!this.loadPixels){ //}else{ return; } / Rotation matrix; three mutually perpendicular unit vectors (with a caveat about reflections) / var v0x=0, v0y=0, v0z=1, v1x=1, v1y=0, v1z=0, v2x=0, v2y=1, v2z=0; var m,t, x,y,z, l,c,i,j; var dx=(mouseX-200)1e-2, dy=(mouseY-200)1e-2, dz; / push main forward-facing vector (v0) aside with the other two orthogonal vectors times the mouse deviation from the middle; normalize / v0x+=dxv1x + dyv2x; v0y+=dxv1y + dyv2y; v0z+=dxv1z + dyv2z; m=1/sqrt(v0xv0x + v0yv0y + v0zv0z); v0x=m; v0y=m; v0z=m; / Tidy up other two vectors, iteratively / for(i=0; i<3; i++){ / Subtract v0 times the dot-product of v0 and v1 from v1, should make v1 orthogonal to v0 (but too short; normalize) / m=v0xv1x + v0yv1y + v0zv1z; v1x-=mv0x; v1y-=mv0y; v1z-=mv0z; m=1/sqrt(v1xv1x + v1yv1y + v1zv1z); v1x=m; v1y=m; v1z=m; / Same as above for v2 / m=v0xv2x + v0yv2y + v0zv2z; v2x-=mv0x; v2y-=mv0y; v2z-=mv0z; m=1/sqrt(v2xv2x + v2yv2y + v2zv2z); v2x=m; v2y=m; v2z=m; /** Set m to half the dot product of v1 and v2 and subtract mv1 from v2 and mv2 from v1 to make them (roughly?) perpendicular */ m=(v1xv2x + v1yv2y + v1zv2z)0.5; x=v1x; y=v1y; z=v1z; v1x-=mv2x; v1y-=mv2y; v1z-=mv2z; v2x-=mx; v2y-=my; v2z-=mz; /* normalize again */ m=1/sqrt(v1xv1x + v1yv1y + v1zv1z); v1x=m; v1y=m; v1z=m; m=1/sqrt(v2xv2x + v2yv2y + v2zv2z); v2x=m; v2y=m; v2z=m; } var siz=200; /* Paint texture */ var t=frameCount0.01; var img;//=getImage("avatars/leaf-orange"); randomSeed(3213); noStroke(); for(i=0; i<32; i++){ x=noise(t,0,i13.1)8; y=noise(t,17.1,i13.1)8; x=(x-(x\|0))64-32; y=(y-(y\|0))64-32; fill(random(16777216)\|0x7f000000); for(j=0; j<4; j++){ //image(img, x, y, 10, 10); ellipse(x+(j&1)64,y+(j>>1&1)64,10,10); } } img=getImage("creatures/OhNoes"); resetMatrix(); translate(32,32); rotate(frameCount); translate(-32,-32); image(img,0,0,64,64); resetMatrix(); this.loadPixels(); var p=this.imageData.data; / Storing texture data locally speeds up access 10-20x; comment out following line to use global tex[] array / var tex=[]; for(i=0; i<4096; i++){ x=i&63; y=i>>6; l=x + y400 << 2; tex[i]=p[l]<<16 \| p[l+1]<<8 \| p[l+2]; } var ms=millis(); for(x=-siz; x<siz; x++){ for(y=-siz; y<siz; y++){ /* Construct ray using rotation matrix, forward-facing vector plus a little sideways/up-down heading times pixel coordinates */ dx=v0x + v1xx5e-3 + v2xy5e-3; dy=v0y + v1yx5e-3 + v2yy5e-3; dz=v0z + v1zx5e-3 + v2zy5e-3; /* how far would this ray travel before it hits the plane? (from a distance of "one") / m=1/dz; / texture coordinates from distance times dx and dy */ var u=1e3+dxm64 & 63, v=1e3+dym64 & 63; /* get texel / c=tex[u \| v<<6]; / brightness is reciprocal of distance (which is dz) */ m=dz0x400\|0; l=80200 + x + y400 << 2; p[l]=(c>>16&255)m >> 10; p[l+1]=(c>>8&255)m >> 10; p[l+2]=(c&255)m >> 10; } } ms=millis()-ms; this.updatePixels(); //fps=constrain(1e3/(ms+5), 10, 40); //gsiz=constrain(gsiz+(ms>25 ? -4 : 4)(abs(ms-25)>2?1:0), 0, 200); fill(0xffff0000); text(ms/+" ("+fps+")"/,20,20); /* diagnose health of rotation matrix, first three numbers are squared length of vectors (should all be one), next three are dot products of every pair (should all be zero) */ text((v0xv0x + v0yv0y + v0zv0z).toFixed(5)+"\n"+ (v1xv1x + v1yv1y + v1zv1z).toFixed(5)+"\n"+ (v2xv2x + v2yv2y + v2zv2z).toFixed(5)+"\n\n"+ (v0xv1x + v0yv1y + v0zv1z).toFixed(5)+"\n"+ (v1xv2x + v1yv2y + v1zv2z).toFixed(5)+"\n"+ (v2xv0x + v2yv0y + v2z*v0z).toFixed(5), 20,50); };
Folds
Fork	false
Key	ag5zfmtoYW4tYWNhZGVteXIUCxIKU2NyYXRjaHBhZBiH-q_sCAw
Votes	184
Spin-Offs	36
Type	PJS
Width	400
Height	400
User Flagged	false
Origin Scratchpad	null
Hidden From Hotlist	false
Restricted Posting	false
By Child	false
Author Nick	Brian French
Author Name	mtrn
Author ID	kaid_686555315868069366831036
Author Profile Access	COACH

Archive Data

Added	10 months ago, 1739284774540
Updated	9 months ago, 1742069701055
Source Deleted	unknown