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
|
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt3D examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "quadplane.h"
/*!
\class QuadPlane
\brief The QuadPlane class holds a 3D model of a large flat plane.
When drawing a large flat plane, such as a wall or a floor, it is desirable
to decompose it into smaller units to make the shading effects look correct.
This class composes a plane out of a configurable number of quads.
*/
/*!
Construct a new QuadPlane with \a size, subdivided \a level times. By default
the plane is 100.0f x 100.0f, and is subdivided 3 times - that is into an
8 x 8 grid.
It is centered on the origin, and lies in the z = 0 plane.
*/
QuadPlane::QuadPlane(QObject *parent, QSizeF size, int level)
: QGLSceneNode(parent)
{
setObjectName(QLatin1String("QuadPlane"));
if (level > 8)
level = 8;
if (level < 1)
level = 1;
int divisions = 1;
for ( ; level--; divisions *= 2) {} // integer 2**n
QSizeF div = size / float(divisions);
QSizeF half = size / 2.0f;
QGLBuilder builder;
QGeometryData zip;
QGeometryData zip2;
for (int yy = 0; yy <= divisions; ++yy)
{
qreal y = half.height() - float(yy) * div.height();
qreal texY = float(yy) / divisions;
for (int xx = 0; xx <= divisions; ++xx)
{
qreal x = half.width() - float(xx) * div.width();
qreal texX = float(xx) / divisions;
zip.appendVertex(QVector3D(x, y, 0));
zip.appendTexCoord(QVector2D(1.0f - texX, 1.0f - texY));
}
if (yy > 0)
builder.addQuadsInterleaved(zip, zip2);
zip2 = zip;
zip2.detach();
zip.clear();
}
QGLSceneNode *n = builder.finalizedSceneNode();
addNode(n);
}
|
