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Reference Guide
TEveTriangleSet.cxx
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1// @(#)root/eve:$Id$
2// Authors: Matevz Tadel & Alja Mrak-Tadel: 2006, 2007
3
4/*************************************************************************
5 * Copyright (C) 1995-2007, Rene Brun and Fons Rademakers. *
6 * All rights reserved. *
7 * *
8 * For the licensing terms see $ROOTSYS/LICENSE. *
9 * For the list of contributors see $ROOTSYS/README/CREDITS. *
10 *************************************************************************/
11
12#include "TEveTriangleSet.h"
13#include "TEveRGBAPalette.h"
14#include "TEveManager.h"
15
16#include "TMath.h"
17#include "TVector3.h"
18#include "TRandom3.h"
19
20
21/** \class TEveTriangleSet
22\ingroup TEve
23Made from a list of vertices and a list of triangles (triplets of
24vertex indices).
25
26If input is composed from triangles with direct vertex coordinates
27one should consider finding all occurrences of the same vertex
28and specifying it only once.
29*/
30
32
33////////////////////////////////////////////////////////////////////////////////
34/// Constructor.
35
37 TEveElementList("TEveTriangleSet", "", kTRUE),
38 fNVerts (nv), fVerts(0),
39 fNTrings (nt), fTrings(0), fTringNorms(0), fTringCols(0)
40{
42
43 fVerts = new Float_t[3*fNVerts];
44 fTrings = new Int_t [3*fNTrings];
45 fTringNorms = (norms) ? new Float_t[3*fNTrings] : 0;
46 fTringCols = (cols) ? new UChar_t[3*fNTrings] : 0;
47}
48
49////////////////////////////////////////////////////////////////////////////////
50/// Destructor.
51
53{
54 delete [] fVerts;
55 delete [] fTrings;
56 delete [] fTringNorms;
57 delete [] fTringCols;
58}
59
60////////////////////////////////////////////////////////////////////////////////
61/// Generate triangle normals via cross product of triangle edges.
62
64{
65 if (fTringNorms == 0) fTringNorms = new Float_t[3*fNTrings];
66
67 TVector3 e1, e2, n;
68 Float_t *norm = fTringNorms;
69 Int_t *tring = fTrings;
70 for(Int_t t=0; t<fNTrings; ++t, norm+=3, tring+=3)
71 {
72 Float_t* v0 = Vertex(tring[0]);
73 Float_t* v1 = Vertex(tring[1]);
74 Float_t* v2 = Vertex(tring[2]);
75 e1.SetXYZ(v1[0]-v0[0], v1[1]-v0[1], v1[2]-v0[2]);
76 e2.SetXYZ(v2[0]-v0[0], v2[1]-v0[1], v2[2]-v0[2]);
77 n = e1.Cross(e2);
78 n.SetMag(1);
79 n.GetXYZ(norm);
80 }
81}
82
83////////////////////////////////////////////////////////////////////////////////
84/// Assign random colors to all triangles.
85
87{
88 if (fTringCols == 0) fTringCols = new UChar_t[3*fNTrings];
89
90 TRandom r;
91 r.SetSeed(0);
92 UChar_t *col = fTringCols;
93 for(Int_t t=0; t<fNTrings; ++t, col+=3)
94 {
95 col[0] = (UChar_t) r.Uniform(60, 255);
96 col[1] = (UChar_t) r.Uniform(60, 255);
97 col[2] = (UChar_t) r.Uniform(60, 255);
98 }
99}
100
101////////////////////////////////////////////////////////////////////////////////
102/// Generate triangle colors by the z-component of the normal.
103/// Current palette is taken from gStyle.
104
106 Bool_t interp, Bool_t wrap)
107{
108 if (fTringCols == 0) fTringCols = new UChar_t[3*fNTrings];
110
111 TEveRGBAPalette pal(min, max, interp, wrap);
112 UChar_t *col = fTringCols;
113 Float_t *norm = fTringNorms;
114 for(Int_t t=0; t<fNTrings; ++t, col+=3, norm+=3)
115 {
116 Int_t v = TMath::Nint(fac * norm[2]);
117 pal.ColorFromValue(v, col, kFALSE);
118 }
119 gEve->Redraw3D();
120}
121
122////////////////////////////////////////////////////////////////////////////////
123/// Compute bounding box.
124/// Virtual from TAttBBox.
125
127{
128 if (fNVerts <= 0) {
129 BBoxZero();
130 return;
131 }
132
133 BBoxInit();
134 Float_t* v = fVerts;
135 for (Int_t i=0; i<fNVerts; ++i, v += 3)
137}
138
139////////////////////////////////////////////////////////////////////////////////
140/// Paint this object. Only direct rendering is supported.
141
143{
144 PaintStandard(this);
145}
146
147////////////////////////////////////////////////////////////////////////////////
148/// Read a simple ascii input file describing vertices and triangles.
149
151{
152 static const TEveException kEH("TEveTriangleSet::ReadTrivialFile ");
153
154 FILE* f = fopen(file, "r");
155 if (f == 0) {
156 ::Error(kEH, "file '%s' not found.", file);
157 return 0;
158 }
159
160 Int_t nv, nt;
161 if (fscanf(f, "%d %d", &nv, &nt) != 2) {
162 fclose(f);
163 throw kEH + "Reading nv, nt failed.";
164 }
165
166 if (nv < 0 || nt < 0) {
167 fclose(f);
168 throw kEH + "Negative number of vertices / triangles specified.";
169 }
170
171 TEveTriangleSet* ts = new TEveTriangleSet(nv, nt);
172
173 Float_t *vtx = ts->Vertex(0);
174 for (Int_t i=0; i<nv; ++i, vtx+=3) {
175 if (fscanf(f, "%f %f %f", &vtx[0], &vtx[1], &vtx[2]) != 3) {
176 fclose(f);
177 throw kEH + TString::Format("Reading vertex data %d failed.", i);
178 }
179 }
180
181 Int_t *tngl = ts->Triangle(0);
182 for (Int_t i=0; i<nt; ++i, tngl+=3) {
183 if (fscanf(f, "%d %d %d", &tngl[0], &tngl[1], &tngl[2]) != 3) {
184 fclose(f);
185 throw kEH + TString::Format("Reading triangle data %d failed.", i);
186 }
187 }
188
189 fclose(f);
190
191 return ts;
192}
ROOT::R::TRInterface & r
Definition: Object.C:4
#define f(i)
Definition: RSha256.hxx:104
int Int_t
Definition: RtypesCore.h:45
unsigned char UChar_t
Definition: RtypesCore.h:38
const Bool_t kFALSE
Definition: RtypesCore.h:101
bool Bool_t
Definition: RtypesCore.h:63
float Float_t
Definition: RtypesCore.h:57
const Bool_t kTRUE
Definition: RtypesCore.h:100
const char Option_t
Definition: RtypesCore.h:66
#define ClassImp(name)
Definition: Rtypes.h:364
R__EXTERN TEveManager * gEve
Definition: TEveManager.h:243
void BBoxCheckPoint(Float_t x, Float_t y, Float_t z)
Definition: TAttBBox.h:58
void BBoxZero(Float_t epsilon=0, Float_t x=0, Float_t y=0, Float_t z=0)
Create cube of volume (2*epsilon)^3 at (x,y,z).
Definition: TAttBBox.cxx:42
void BBoxInit(Float_t infinity=1e6)
Dynamic Float_t[6] X(min,max), Y(min,max), Z(min,max)
Definition: TAttBBox.cxx:29
A list of TEveElements.
Definition: TEveElement.h:433
virtual void InitMainTrans(Bool_t can_edit=kTRUE)
Initialize the main transformation to identity matrix.
virtual void PaintStandard(TObject *id)
Paint object – a generic implementation for EVE elements.
Exception class thrown by TEve classes and macros.
Definition: TEveUtil.h:102
void Redraw3D(Bool_t resetCameras=kFALSE, Bool_t dropLogicals=kFALSE)
Definition: TEveManager.h:168
A generic, speed-optimised mapping from value to RGBA color supporting different wrapping and range t...
const UChar_t * ColorFromValue(Int_t val) const
Made from a list of vertices and a list of triangles (triplets of vertex indices).
Float_t * fTringNorms
~TEveTriangleSet()
Destructor.
void GenerateZNormalColors(Float_t fac=20, Int_t min=-20, Int_t max=20, Bool_t interp=kFALSE, Bool_t wrap=kFALSE)
Generate triangle colors by the z-component of the normal.
void GenerateRandomColors()
Assign random colors to all triangles.
Float_t * Vertex(Int_t i)
virtual void ComputeBBox()
Compute bounding box.
static TEveTriangleSet * ReadTrivialFile(const char *file)
Read a simple ascii input file describing vertices and triangles.
TEveTriangleSet(const TEveTriangleSet &)
virtual void Paint(Option_t *option="")
Paint this object. Only direct rendering is supported.
UChar_t * fTringCols
void GenerateTriangleNormals()
Generate triangle normals via cross product of triangle edges.
Int_t * Triangle(Int_t i)
virtual void Error(const char *method, const char *msgfmt,...) const
Issue error message.
Definition: TObject.cxx:893
This is the base class for the ROOT Random number generators.
Definition: TRandom.h:27
static TString Format(const char *fmt,...)
Static method which formats a string using a printf style format descriptor and return a TString.
Definition: TString.cxx:2336
void SetXYZ(Double_t x, Double_t y, Double_t z)
Definition: TVector3.h:227
TVector3 Cross(const TVector3 &) const
Definition: TVector3.h:335
const Int_t n
Definition: legend1.C:16
SEXP wrap(const TString &s)
Definition: RExports.h:64
Int_t Nint(T x)
Round to nearest integer. Rounds half integers to the nearest even integer.
Definition: TMath.h:663
Definition: file.py:1