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Proof of concept sphere thing for metavoxels.

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This commit is contained in:
Andrzej Kapolka 2013-12-17 16:56:52 -08:00
parent a5c8531aa1
commit e6a41b2003
2 changed files with 176 additions and 11 deletions
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171
interface/resources/scripts/sphere.js Normal file
View file

@ -0,0 +1,171 @@
//
// sphere.js
// interface
//
// Created by Andrzej Kapolka on 12/17/13.
// Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
//
function strictIndexOf(array, element) {
for (var i = 0; i < array.length; i++) {
if (array[i] == element) {
return i;
}
}
return -1;
}
var colorIndex;
var normalIndex;
var visitor;
var info;
var MAX_DEPTH = 5;
var sphereCenter = [ 0.5, 0.5, 0.5 ];
var sphereColor = 0xFFFF00FF;
var sphereRadius = 0.25;
var sphereRadiusSquared = sphereRadius * sphereRadius;
function lengthSquared(x, y, z) {
return x*x + y*y + z*z;
}
function setNormal(vector) {
if (normalIndex != -1) {
var length = Math.sqrt(lengthSquared(vector[0], vector[1], vector[2]));
if (length == 0.0) {
info.attributeValues[normalIndex] = 0x007F00;
} else {
var scale = 127.0 / length;
info.attributeValues[normalIndex] =
(Math.floor(vector[0] * scale) & 0xFF) << 16 |
(Math.floor(vector[1] * scale) & 0xFF) << 8 |
Math.floor(vector[2] * scale) & 0xFF;
}
}
}
function guide(minimum, size, depth) {
info.minimum = minimum;
info.size = size;
// start with a relative fast bounding volume test to find most non-intersecting states
var maximum = [ minimum[0] + size, minimum[1] + size, minimum[2] + size ];
if (minimum[0] >= sphereCenter[0] + sphereRadius ||
minimum[1] >= sphereCenter[1] + sphereRadius ||
minimum[2] >= sphereCenter[2] + sphereRadius ||
maximum[0] <= sphereCenter[0] - sphereRadius ||
maximum[1] <= sphereCenter[1] - sphereRadius ||
maximum[2] <= sphereCenter[2] - sphereRadius) {
info.isLeaf = true;
if (colorIndex != -1) {
info.attributeValues[colorIndex] = 0x0;
}
visitor.visit(info);
return;
}
var halfSize = size / 2;
var center = [ minimum[0] + halfSize, minimum[1] + halfSize, minimum[2] + halfSize ];
var vector = [ center[0] - sphereCenter[0], center[1] - sphereCenter[1], center[2] - sphereCenter[2] ];
// count the number of points inside the sphere
var inside = 0;
if (lengthSquared(sphereCenter[0] - minimum[0], sphereCenter[1] - minimum[1], sphereCenter[2] - minimum[2]) <=
sphereRadiusSquared) {
inside++;
}
if (lengthSquared(sphereCenter[0] - maximum[0], sphereCenter[1] - minimum[1], sphereCenter[2] - minimum[2]) <=
sphereRadiusSquared) {
inside++;
}
if (lengthSquared(sphereCenter[0] - minimum[0], sphereCenter[1] - maximum[1], sphereCenter[2] - minimum[2]) <=
sphereRadiusSquared) {
inside++;
}
if (lengthSquared(sphereCenter[0] - maximum[0], sphereCenter[1] - maximum[1], sphereCenter[2] - minimum[2]) <=
sphereRadiusSquared) {
inside++;
}
if (lengthSquared(sphereCenter[0] - minimum[0], sphereCenter[1] - minimum[1], sphereCenter[2] - maximum[2]) <=
sphereRadiusSquared) {
inside++;
}
if (lengthSquared(sphereCenter[0] - maximum[0], sphereCenter[1] - minimum[1], sphereCenter[2] - maximum[2]) <=
sphereRadiusSquared) {
inside++;
}
if (lengthSquared(sphereCenter[0] - minimum[0], sphereCenter[1] - maximum[1], sphereCenter[2] - maximum[2]) <=
sphereRadiusSquared) {
inside++;
}
if (lengthSquared(sphereCenter[0] - maximum[0], sphereCenter[1] - maximum[1], sphereCenter[2] - maximum[2]) <=
sphereRadiusSquared) {
inside++;
}
// see if all points are in the sphere
if (inside == 8) {
info.isLeaf = true;
if (colorIndex != -1) {
info.attributeValues[colorIndex] = sphereColor;
}
setNormal(vector);
visitor.visit(info);
return;
}
// if we've reached max depth, compute alpha using a volume estimate
if (depth == MAX_DEPTH) {
info.isLeaf = true;
if (inside >= 3) {
if (colorIndex != -1) {
info.attributeValues[colorIndex] = sphereColor;
}
setNormal(vector);
} else {
if (colorIndex != -1) {
info.attributeValues[colorIndex] = 0x0;
}
}
visitor.visit(info);
return;
}
// recurse
info.isLeaf = false;
if (!visitor.visit(info)) {
return;
}
depth += 1;
guide(minimum, halfSize, depth);
guide([ center[0], minimum[1], minimum[2] ], halfSize, depth);
guide([ minimum[0], center[1], minimum[2] ], halfSize, depth);
guide([ center[0], center[1], minimum[2] ], halfSize, depth);
guide([ minimum[0], minimum[1], center[2] ], halfSize, depth);
guide([ center[0], minimum[1], center[2] ], halfSize, depth);
guide([ minimum[0], center[1], center[2] ], halfSize, depth);
guide([ center[0], center[1], center[2] ], halfSize, depth);
}
(function(visitation) {
var attributes = visitation.visitor.getAttributes();
colorIndex = strictIndexOf(attributes, AttributeRegistry.colorAttribute);
normalIndex = strictIndexOf(attributes, AttributeRegistry.normalAttribute);
visitor = visitation.visitor;
info = { attributeValues: new Array(attributes.length) };
// have the sphere orbit the center and pulse in size
var time = new Date().getTime();
var ROTATE_PERIOD = 400.0;
sphereCenter[0] = 0.5 + 0.25 * Math.cos(time / ROTATE_PERIOD);
sphereCenter[2] = 0.5 + 0.25 * Math.sin(time / ROTATE_PERIOD);
var PULSE_PERIOD = 300.0;
sphereRadius = 0.25 + 0.0625 * Math.cos(time / PULSE_PERIOD);
sphereRadiusSquared = sphereRadius * sphereRadius;
guide(visitation.info.minimum, visitation.info.size, 0);
})

16
interface/src/renderer/MetavoxelSystem.cpp
View file

@ -6,6 +6,8 @@
// Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
//
#include <QFile>
#include <QTextStream>
#include <QtDebug>
#include <SharedUtil.h>
@ -41,17 +43,9 @@ void MetavoxelSystem::init() {
_data.setAttributeValue(p1, AttributeValue(color, encodeInline(qRgba(0xFF, 0xFF, 0xFF, 0xFF))));
QScriptValue guideFunction = _scriptEngine.evaluate(
"(function(visitation) { "
" var attributes = visitation.visitor.getAttributes();"
" var colorIndex = attributes.indexOf(AttributeRegistry.colorAttribute);"
" var normalIndex = attributes.indexOf(AttributeRegistry.normalAttribute);"
" for (var i = 0; i < attributes.length; i++) {"
" print(attributes[i].getName() + ' ');"
" }"
" print('\\n');"
" visitation.visitor.visit(visitation.info);"
"})");
QFile scriptFile("resources/scripts/sphere.js");
scriptFile.open(QIODevice::ReadOnly);
QScriptValue guideFunction = _scriptEngine.evaluate(QTextStream(&scriptFile).readAll());
_data.setAttributeValue(MetavoxelPath(), AttributeValue(AttributeRegistry::getInstance()->getGuideAttribute(),
encodeInline(PolymorphicDataPointer(new ScriptedMetavoxelGuide(guideFunction)))));