aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/src/others/irrlicht-1.8.1/source/Irrlicht/COctreeTriangleSelector.cpp
blob: 657f91143baedd263223b0a3a1c7681a3c80bd9c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#include "COctreeTriangleSelector.h"
#include "ISceneNode.h"

#include "os.h"

namespace irr
{
namespace scene
{

//! constructor
COctreeTriangleSelector::COctreeTriangleSelector(const IMesh* mesh,
		ISceneNode* node, s32 minimalPolysPerNode)
	: CTriangleSelector(mesh, node), Root(0), NodeCount(0),
	 MinimalPolysPerNode(minimalPolysPerNode)
{
	#ifdef _DEBUG
	setDebugName("COctreeTriangleSelector");
	#endif

	if (!Triangles.empty())
	{
		const u32 start = os::Timer::getRealTime();

		// create the triangle octree
		Root = new SOctreeNode();
		Root->Triangles = Triangles;
		constructOctree(Root);

		c8 tmp[256];
		sprintf(tmp, "Needed %ums to create OctreeTriangleSelector.(%d nodes, %u polys)",
			os::Timer::getRealTime() - start, NodeCount, Triangles.size());
		os::Printer::log(tmp, ELL_INFORMATION);
	}
}


//! destructor
COctreeTriangleSelector::~COctreeTriangleSelector()
{
	delete Root;
}


void COctreeTriangleSelector::constructOctree(SOctreeNode* node)
{
	++NodeCount;

	node->Box.reset(node->Triangles[0].pointA);

	// get bounding box
	const u32 cnt = node->Triangles.size();
	for (u32 i=0; i<cnt; ++i)
	{
		node->Box.addInternalPoint(node->Triangles[i].pointA);
		node->Box.addInternalPoint(node->Triangles[i].pointB);
		node->Box.addInternalPoint(node->Triangles[i].pointC);
	}

	const core::vector3df& middle = node->Box.getCenter();
	core::vector3df edges[8];
	node->Box.getEdges(edges);

	core::aabbox3d<f32> box;
	core::array<core::triangle3df> keepTriangles;

	// calculate children

	if (!node->Box.isEmpty() && (s32)node->Triangles.size() > MinimalPolysPerNode)
	for (s32 ch=0; ch<8; ++ch)
	{
		box.reset(middle);
		box.addInternalPoint(edges[ch]);
		node->Child[ch] = new SOctreeNode();

		for (s32 i=0; i<(s32)node->Triangles.size(); ++i)
		{
			if (node->Triangles[i].isTotalInsideBox(box))
			{
				node->Child[ch]->Triangles.push_back(node->Triangles[i]);
				//node->Triangles.erase(i);
				//--i;
			}
			else
			{
				keepTriangles.push_back(node->Triangles[i]);
			}
		}
		memcpy(node->Triangles.pointer(), keepTriangles.pointer(),
			sizeof(core::triangle3df)*keepTriangles.size());

		node->Triangles.set_used(keepTriangles.size());
		keepTriangles.set_used(0);

		if (node->Child[ch]->Triangles.empty())
		{
			delete node->Child[ch];
			node->Child[ch] = 0;
		}
		else
			constructOctree(node->Child[ch]);
	}
}


//! Gets all triangles which lie within a specific bounding box.
void COctreeTriangleSelector::getTriangles(core::triangle3df* triangles,
					s32 arraySize, s32& outTriangleCount,
					const core::aabbox3d<f32>& box,
					const core::matrix4* transform) const
{
	core::matrix4 mat(core::matrix4::EM4CONST_NOTHING);
	core::aabbox3d<f32> invbox = box;

	if (SceneNode)
	{
		SceneNode->getAbsoluteTransformation().getInverse(mat);
		mat.transformBoxEx(invbox);
	}

	if (transform)
		mat = *transform;
	else
		mat.makeIdentity();

	if (SceneNode)
		mat *= SceneNode->getAbsoluteTransformation();

	s32 trianglesWritten = 0;

	if (Root)
		getTrianglesFromOctree(Root, trianglesWritten,
			arraySize, invbox, &mat, triangles);

	outTriangleCount = trianglesWritten;
}


void COctreeTriangleSelector::getTrianglesFromOctree(
		SOctreeNode* node, s32& trianglesWritten,
		s32 maximumSize, const core::aabbox3d<f32>& box,
		const core::matrix4* mat, core::triangle3df* triangles) const
{
	if (!box.intersectsWithBox(node->Box))
		return;

	const u32 cnt = node->Triangles.size();

	for (u32 i=0; i<cnt; ++i)
	{
		const core::triangle3df& srcTri = node->Triangles[i];
		// This isn't an accurate test, but it's fast, and the 
		// API contract doesn't guarantee complete accuracy.
		if (srcTri.isTotalOutsideBox(box))
			continue;

		core::triangle3df& dstTri = triangles[trianglesWritten];
		mat->transformVect(dstTri.pointA, srcTri.pointA );
		mat->transformVect(dstTri.pointB, srcTri.pointB );
		mat->transformVect(dstTri.pointC, srcTri.pointC );
		++trianglesWritten;

		// Halt when the out array is full.
		if (trianglesWritten == maximumSize)
			return;
	}

	for (u32 i=0; i<8; ++i)
		if (node->Child[i])
			getTrianglesFromOctree(node->Child[i], trianglesWritten,
			maximumSize, box, mat, triangles);
}


//! Gets all triangles which have or may have contact with a 3d line.
// new version: from user Piraaate
void COctreeTriangleSelector::getTriangles(core::triangle3df* triangles, s32 arraySize,
		s32& outTriangleCount, const core::line3d<f32>& line,
		const core::matrix4* transform) const
{
#if 0
	core::aabbox3d<f32> box(line.start);
	box.addInternalPoint(line.end);

	// TODO: Could be optimized for line a little bit more.
	COctreeTriangleSelector::getTriangles(triangles, arraySize, outTriangleCount,
		box, transform);
#else

	core::matrix4 mat ( core::matrix4::EM4CONST_NOTHING );

	core::vector3df vectStartInv ( line.start ), vectEndInv ( line.end );
	if (SceneNode)
	{
		mat = SceneNode->getAbsoluteTransformation();
		mat.makeInverse();
		mat.transformVect(vectStartInv, line.start);
		mat.transformVect(vectEndInv, line.end);
	}
	core::line3d<f32> invline(vectStartInv, vectEndInv);

	mat.makeIdentity();

	if (transform)
		mat = (*transform);

	if (SceneNode)
		mat *= SceneNode->getAbsoluteTransformation();

	s32 trianglesWritten = 0;

	if (Root)
		getTrianglesFromOctree(Root, trianglesWritten, arraySize, invline, &mat, triangles);

	outTriangleCount = trianglesWritten;
#endif
}

void COctreeTriangleSelector::getTrianglesFromOctree(SOctreeNode* node,
		s32& trianglesWritten, s32 maximumSize, const core::line3d<f32>& line,
		const core::matrix4* transform, core::triangle3df* triangles) const
{
	if (!node->Box.intersectsWithLine(line))
		return;

	s32 cnt = node->Triangles.size();
	if (cnt + trianglesWritten > maximumSize)
		cnt -= cnt + trianglesWritten - maximumSize;

	s32 i;

	if ( transform->isIdentity() )
	{
		for (i=0; i<cnt; ++i)
		{
			triangles[trianglesWritten] = node->Triangles[i];
			++trianglesWritten;
		}
	}
	else
	{
		for (i=0; i<cnt; ++i)
		{
			triangles[trianglesWritten] = node->Triangles[i];
			transform->transformVect(triangles[trianglesWritten].pointA);
			transform->transformVect(triangles[trianglesWritten].pointB);
			transform->transformVect(triangles[trianglesWritten].pointC);
			++trianglesWritten;
		}
	}

	for (i=0; i<8; ++i)
		if (node->Child[i])
			getTrianglesFromOctree(node->Child[i], trianglesWritten,
			maximumSize, line, transform, triangles);
}


} // end namespace scene
} // end namespace irr