Selection convert to 2D not very Efficient

Wow! That's wonderful!

I am looking forward to it.

Hi Sergey,

Yeah, I am learning the Visualization module now.
I want to understand the detection algorithm, because of there is a fascinating function for the interactive with the model objects, such as the dragger in the OpenSceneGraph:

Figure 1. Dragger in OpenSceneGraph

Figure 2. Model Editor

You can transform(translate/rotate) the model by moving the mouse on the handler and then drag the handler directly, this is very convenient for model transformation.

When I have the good test cases about performance problem, I will share here.

Best regards,
Xing

Hello Sergey,

I wrote a simple Tcl script for the Draw Test Harness to test the performance of switch selection mode, the Tcl script list as follows:


#
# Test Active Selection Mode performance of occ.
#
# Shing Liu(eryar@163.com)
# 2015-03-06 18:02
#

pload ALL

# build a simple scene filled with boxes, cylinders and spheres.
box b 1 2 3

pcylinder c 1 2
ttranslate c 0 0 10

psphere s 1
ttranslate s 0 0 20

set N 10

# array shapes.
set k 0
for {set i 0} {$i < $N} {incr i} {
for {set j 0} {$j < $N} {incr j} {
tcopy b b$k
tcopy c c$k
tcopy s s$k

ttranslate b$k $i*5 $j*5 0.0
ttranslate c$k $i*5 $j*5 0.0
ttranslate s$k $i*5 $j*5 0.0

vdisplay b$k c$k s$k

incr k
}
}

# set display mode to shading.
vsetdispmode 1
vfit

# show system info.
dversion
meminfo
vglinfo

# activates selection mode for all shapes.
puts "active selection mode: vertex"
puts "------------------------------------------"
chrono t1 start
vsetam 1
chrono t1 show
puts "------------------------------------------"

puts "active selection mode: edge"
puts "------------------------------------------"
chrono t2 start
vsetam 2
chrono t2 show
puts "------------------------------------------"

puts "active selection mode: face"
puts "------------------------------------------"
chrono t3 start
vsetam 4
chrono t3 show
puts "------------------------------------------"

From the Tcl Script, I build a simple scene filled with boxes, cylinders and spheres, there total number is 300, and output the time consuming when change selection mode, here is my output:

Draw[1]> source test.tcl
active selection mode: vertex
------------------------------------------
Elapsed time: 0 Hours 0 Minutes 1.7083635909 Seconds
CPU user time: 1.7004109 seconds
CPU system time: 0 seconds
------------------------------------------
active selection mode: edge
------------------------------------------
Elapsed time: 0 Hours 0 Minutes 3.31749469514 Seconds
CPU user time: 3.3228213 seconds
CPU system time: 0 seconds
------------------------------------------
active selection mode: face
------------------------------------------
Elapsed time: 0 Hours 0 Minutes 5.0015310459 Seconds
CPU user time: 4.9764319 seconds
CPU system time: 0 seconds
------------------------------------------
Draw[2]>

Hope the output result will helpful to you.

Best Regards,
Shing Liu