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First commit of 'Death Star' voxel planet

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This commit is contained in:
Philip Rosedale 2013-02-21 11:25:52 -08:00
parent 5f60bf6376
commit 67115ccad4
1 changed files with 32 additions and 18 deletions
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50
interface/src/VoxelSystem.cpp
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@ -8,6 +8,12 @@
#include "VoxelSystem.h"
bool onSphereShell(float radius, float scale, glm::vec3 * position) {
float vRadius = glm::length(*position);
return ((vRadius + scale/2.0 > radius) && (vRadius - scale/2.0 < radius));
}
void VoxelSystem::init() {
root = new Voxel;
}
@ -21,42 +27,48 @@ int VoxelSystem::initVoxels(Voxel * voxel, float scale, glm::vec3 * position) {
int newVoxels = 0;
if (voxel == NULL) voxel = root;
averageColor[0] = averageColor[1] = averageColor[2] = 0.0;
const float RADIUS = 3.9;
//
// First, decide whether I should be a leaf node and set/return if so
// First, randomly decide whether to stop here without recursing for children
//
if ((randFloat() < 0.1) && (scale < 1.0))
if (onSphereShell(RADIUS, scale, position) && (scale < 0.25) && (randFloat() < 0.01))
{
voxel->color.x = voxel->color.y = voxel->color.z = 0.5 + randFloat()*0.5;
voxel->color.x = 0.1;
voxel->color.y = 0.5 + randFloat()*0.5;
voxel->color.z = 0.1;
for (unsigned char i = 0; i < NUM_CHILDREN; i++) voxel->children[i] = NULL;
return 0;
} else {
// Decide whether to make kids, recurse into them
for (unsigned char i = 0; i < NUM_CHILDREN; i++) {
if ((scale > 0.01) && (randFloat() > 0.6))
{
// Make a new child
voxel->children[i] = new Voxel;
newVoxels++;
childrenCreated++;
if (scale > 0.01) {
glm::vec3 shift(scale/2.0*((i&4)>>2)-scale/4.0,
scale/2.0*((i&2)>>1)-scale/4.0,
scale/2.0*(i&1)-scale/4.0);
*position += shift;
newVoxels += initVoxels(voxel->children[i], scale/2.0, position);
// Test to see whether the child is also on edge of sphere
if (onSphereShell(RADIUS, scale/2.0, position)) {
voxel->children[i] = new Voxel;
newVoxels++;
childrenCreated++;
newVoxels += initVoxels(voxel->children[i], scale/2.0, position);
averageColor += voxel->children[i]->color;
} else voxel->children[i] = NULL;
*position -= shift;
averageColor += voxel->children[i]->color;
} else {
// No child made: Set pointer to null, nothing to see here.
voxel->children[i] = NULL;
}
}
if (childrenCreated > 0) {
// If there were children created, set this voxels color to the average of it's children
// If there were children created, the color of this voxel node is average of children
averageColor *= 1.0/childrenCreated;
voxel->color = averageColor;
return newVoxels;
} else {
// Tested and didn't make any children, so i've still got to be a leaf
// Tested and didn't make any children, so choose my color as a leaf, return
voxel->color.x = voxel->color.y = voxel->color.z = 0.5 + randFloat()*0.5;
for (unsigned char i = 0; i < NUM_CHILDREN; i++) voxel->children[i] = NULL;
return 0;
@ -65,7 +77,12 @@ int VoxelSystem::initVoxels(Voxel * voxel, float scale, glm::vec3 * position) {
}
}
const float RENDER_DISCARD = 0.01;
//
// The Render Discard is the ratio of the size of the voxel to the distance from the camera
// at which the voxel will no longer be shown. Smaller = show more detail.
//
const float RENDER_DISCARD = 0.04; //0.01;
//
// Returns the total number of voxels actually rendered
@ -83,7 +100,6 @@ int VoxelSystem::render(Voxel * voxel, float scale, glm::vec3 * distance) {
scale/2.0*(i&1)-scale/4.0);
if ((voxel->children[i] != NULL) && (scale / glm::length(*distance) > RENDER_DISCARD)) {
glTranslatef(shift.x, shift.y, shift.z);
//std::cout << "x,y,z: " << shift.x << "," << shift.y << "," << shift.z << "\n";
*distance += shift;
vRendered += render(voxel->children[i], scale/2.0, distance);
*distance -= shift;
@ -94,10 +110,8 @@ int VoxelSystem::render(Voxel * voxel, float scale, glm::vec3 * distance) {
// Render this voxel if the children were not rendered
if (!renderedChildren)
{
//glColor4f(1,1,1,1);
// This is the place where we need to copy this data to a VBO to make this FAST
glColor4f(voxel->color.x, voxel->color.y, voxel->color.z, 1.0);
//float bright = 1.0 - glm::length(*distance)/20.0;
//glColor3f(bright,bright,bright);
glutSolidCube(scale);
vRendered++;
}