Does anyone know if the scatter file transformation matrix recognizes scaling values? Every time I try to randomly scale objects they get distorted.
I thought it was a simple matter of multiply the scale factor to the appropriate matrix cell. In this case, it appears to be:
sx 0 0 0
0 sy 0 0
0 0 sz 0
0 0 0 1
Where sx, sy, and sz are the factors to be applied. Or am I doing this in the wrong direction?
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If anyone is interested here's a simple javascript I wrote to create output you can cut and paste as a scatter file.
Code: Select all
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Scatter File Randomizer</title>
</head>
<body>
<label>translate uniform</label><input id="translate" type="text"><br>
<label>trans x</label><input id="transx" type="text"><br>
<label>trans y</label><input id="transy" type="text"><br>
<label>trans z</label><input id="transz" type="text"><br>
<label>rot x</label><input id="rotx" type="text"><br>
<label>rot y</label><input id="roty" type="text"><br>
<label>rot z</label><input id="rotz" type="text"><br>
<label>scale uniform</label><input id="scale" type="text"><br>
<label>scale x</label><input id="scalex" type="text"><br>
<label>scale y</label><input id="scaley" type="text"><br>
<label>scale z</label><input id="scalez" type="text"><br><br>
<label>Quantity</label><input id="qty" type="text" value=10><br>
<input type='button' onclick="createTransform()" value = "start">
<div id="test">test
</div>
</body>
<script language = "javascript">
var matrix = new Array(1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1); // standard transformation matrix
function createTransform(){
var qty = document.getElementById('qty').value;
var str = '';
for (var i = 0; i < qty; i++)
str = rotationRange() + str;
document.getElementById('test').innerHTML = str;
}
function randomNum(){
var rnd = Math.random()
return rnd;
}
function rotationRange(){
var defaultVal = 1;
var x = document.getElementById("rotx").value;
var y = document.getElementById("roty").value;
var z = document.getElementById("rotz").value;
var a = 180 * randomNum();
var d = document.getElementById('translate').value;
var dx = document.getElementById('transx').value;
var dy = document.getElementById('transy').value;
var dz = document.getElementById('transz').value;
var s = document.getElementById('scale').value;
var sx = document.getElementById('scalex').value;
var sy = document.getElementById('scaley').value;
var sz = document.getElementById('scalez').value;
// ------------ rotate -----------------//
if(x == '') x = defaultVal * randomNum();
else x = x * randomNum();
if(y == '') y = defaultVal * randomNum();
else y = y * randomNum();
if(z == '') z = defaultVal * randomNum();
else z = z * randomNum();
// -------------- translate ----------- //
if(d == '')
defaultVal = 200;
else
defaultVal = d;
if(dx == '') dx = defaultVal * randomNum();
else dx = dx * randomNum();
if(dy == '') dy = defaultVal * randomNum();
else dy = dy * randomNum();
if(dz == '') dz = defaultVal * randomNum();
else dz = dz * randomNum();
// ------------ scale -------------------//
if(s == '') defaultVal = 1;
else defaultVal = s;
var uniformScale = randomNum();
if(sx == '') sx = defaultVal * uniformScale;
else sx = sx * randomNum();
if(sy == '') sy = defaultVal * uniformScale;
else sy = sy * randomNum();
if(sz == '') sz = defaultVal * uniformScale;
else sz = sz * randomNum();
// borrowed this code snippet from http://evanw.github.io/lightgl.js/docs/matrix.html - me likey.
var m = matrix;
var d = Math.sqrt(x*x + y*y + z*z) ;
a *= Math.PI / 180; x /= d; y /= d; z /= d;
var c = Math.cos(a), s = Math.sin(a), t = 1 - c;
m[0] = (x * x * t + c) * sx ; //scale x
m[1] = x * y * t - z * s;
m[2] = x * z * t + y * s;
m[3] = dx;
m[4] = y * x * t + z * s;
m[5] = (y * y * t + c) * sy; // scale y
m[6] = y * z * t - x * s;
m[7] = dy;
m[8] = z * x * t - y * s;
m[9] = z * y * t + x * s;
m[10] = (z * z * t + c) * sz ; // scale z
m[11] = dz;
m[12] = 0; // we are ignoring these - not recognized by Octane
m[13] = 0;
m[14] = 0;
m[15] = 1;
var out ='';
for (var i =0; i<12; i++) {
out = out+ m[i] + " ";
}
return out + "<br>";
}
//document.getElementById('test').innerHTML=out;
</script>
</html>
For some reason when using the scatter file, you can not focus the camera on the objects.
- No focus on objects using camera and render target.
Then if you just use the default camera and click on the geometry goup you can see them perfectly.
- Focus achieved with default camera
This may not be a octane issue, as I built these asteroids with sculptris...they could have polygon problem...notheless, only one
of the three objects accepts the materials.
- Not all geometry accepts materials
