OpenGL viewer for Bezier surfaces

• Tensor product Bezier patches
• Tensor product rational patches
• Triangle Bezier patches
• Polyhedron
• PN triangles, PN quadrilateral patches
• Gaussian/Mean/Max/Min curvature plot
• Plane clipping
• Position save/load
• Object groups different colors can be assigned to different groups
• Environment mapping (Image file: room.bmp)

Prerequisites:

• Qt 4.8 development package
  • Linux: Look for qt4 in your distribution package manager
  • Windows & OSX: http://download.qt.io/archive/qt/4.8/4.8.6/
• QtCreator (optional)

• Open QtCreator (/usr/bin/qtcreator)
• Open BezierView.pro by using "File -> Open File or Project..."
• Accept the default configuration and hit "Configure Project"
• Run Qmake from "Build -> Run QMake"
• Build the project "Build -> Build All"
• Run BezierView from "Build -> Run"

qmake BezierView.pro
make
./bview

The data file contains segments, each segment represents one patch.

At the the beginning of each segment, there is a number indicating the patch type, then a block of patch data should follow.

• 1: polyhedron
• 3: triangular patch
• 4: tensor-product patch with same degree in both directions.
• 5: general tensor-product patch
• 8: rational Bezier tensor-product
• 9: PN triangle patches
• 10: PN quads patches

the patch data should contain:

Vnum Fnum
v0x v0y v0z
v1x v1y v1z
..
v(n-1)x v(n-1)y v(n-1)z
3 f1v1 f1v2 f1v3   (OR: 4 f1v1 f1v2 f1v3 f1v4)
...
3 fmv1 fmv2 fmv3    ( vertices are indices from [0, n-1], not [1,n])

it should contain:

degu degv (or type 3 and 4, only degu)

Then the x y z value of the control points. The control points are sorted using row-major order of following matrix with size ( rows= degu+1) x (columns= degv+1) :

p11       p12    .... p1(degv+1)
p21       p22    .... p2(degv+1)
..       ..     ....    ..
p(degu+1)1 p(degu+1)1 .. p(degu+1)(degv+1)

i.e.

{{{ p11 p12 ... p1(degv+1) p21 ... p2(degv+1) .... p(degu+1)1 ... p(degu+1)(degv+1) }}}

it should contain:

deg

then the the x y z value of the (deg+2)*(deg+1)/2 control points. the order of a cubic patch is , for instance, the following:

   9
  7 8
 4 5 6
0 1 2 3

the patch data then is

p0 p1 p2p p3 ... p9

it should contain:

deg Ndeg

then the control points; then the normals arranged at the same order as the control points.

it should contain:

degu degv Ndegu Ndegv

then the control points; then the normals arranged at the same order

• simple data
  • tensor product patches: hex.bv hex2.bv tp2x1.bv tp3x3.bv
  • triangular patches: tri1.bv tri2.bv
  • rational patches: rat1.bv tor.bv sphear.bv
• utal teapot teapot.bv teapot2.bv tpt_grp.bv
• polyhedra data cube.bv closedcone.bv hand.bv tetra.bv
• mixed data tp_poly.bv
• group data tpt_grp.bv tridat.cube
• g2 patchs plm.icosa.260 plm.tw.700 plm.oct.100 cubeg2 twg2.bv cubeg2.bv

Copyright (C) 2015 SurfLab, University of Florida.

This program is free for educational/research purpose. You will need to gain permissions from authors before you can use this program or any part of the source code for commercial usage.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY.

Author(s):

• Saleh Dindar
• Xiaobin Wu
• Jorg Peters