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https://git.dev.opencascade.org/repos/occt.git
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05aa616d6d
Existing OCCT path tracing engine used very simple additive material (BSDF) model, so it was possible to reproduce behavior only of very basic materials such as metal, glass, or plastic. However, some important in CAD industry materials like car paint or ceramic could not be modeled well. In this patch, OCCT BSDF was significantly improved by replacing additive model with two-layered scattering model. Therefore, we have base diffuse, glossy, or transmissive layer, covered by one glossy/specular coat. The layers themselves have no thickness; they can simply reflect light or transmits it to the layer under it. Balancing different combinations of layer properties can produce a wide range of different effects. At the same time, disabling the first (coat) layer allows to keep full compatibility with previously supported scattering model. All new parameters are available via 'vbsdf' command. Location of new sample for few material examples: samples\tcl\pathtrace_materials.tcl Fix shader compilation issue. Fix test case sample_ball_alpha. Shaders_PathtraceBase_fs.pxx - regenerate resource from origin
227 lines
5.9 KiB
Tcl
227 lines
5.9 KiB
Tcl
# Script demonstrating Global illumination materials
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# using path tracing rendering engine in 3D view
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#Category: Visualization
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#Title: Path tracing - Materials
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set aBallPath [locate_data_file occ/Ball.brep]
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pload MODELING VISUALIZATION
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# Setup 3D viewer
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vclear
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vinit name=View1 w=512 h=512
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vglinfo
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vvbo 0
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vsetdispmode 1
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# Restore exported shapes
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restore $aBallPath Ball0
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restore $aBallPath Ball1
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restore $aBallPath Ball2
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restore $aBallPath Ball3
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restore $aBallPath Ball4
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restore $aBallPath Ball5
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restore $aBallPath Ball6
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restore $aBallPath Ball7
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restore $aBallPath Ball8
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# Create chessboard-style floor
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box tile 10 10 0.1
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eval compound [lrepeat 144 tile] tiles
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explode tiles
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for {set i 0} {$i < 12} {incr i} {
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for {set j 1} {$j <= 12} {incr j} {
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ttranslate tiles_[expr 12 * $i + $j] [expr $i * 10 - 90] [expr $j * 10 - 70] -0.15
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vdisplay -noupdate tiles_[expr 12 * $i + $j]
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vsetmaterial -noupdate tiles_[expr 12 * $i + $j] plaster
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if {($i + $j) % 2 == 0} {
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vbsdf tiles_[expr 12 * $i + $j] -kd 0.85
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} else {
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vbsdf tiles_[expr 12 * $i + $j] -kd 0.45
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}
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}
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}
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# Setup object 'Ball1'
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vdisplay Ball1
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vsetmaterial Ball1 Brass
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vbsdf Ball1 -Kc 0 0 0
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vbsdf Ball1 -Kd 0.272798 0.746262 0.104794
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vbsdf Ball1 -Ks 0.253738 0.253738 0.253738
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vbsdf Ball1 -Kt 0 0 0
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vbsdf Ball1 -baseRoughness 0.045
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vbsdf Ball1 -coatRoughness 0
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vbsdf Ball1 -Le 0 0 0
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vbsdf Ball1 -absorpColor 0 0 0
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vbsdf Ball1 -absorpCoeff 0
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vbsdf Ball1 -coatFresnel Constant 0
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vbsdf Ball1 -baseFresnel Schlick 0.58 0.42 0.2
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vlocation Ball1 -rotation 0 0 0 1
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vlocation Ball1 -location 10 0 0
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# Setup object 'Ball2'
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vdisplay Ball2
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vsetmaterial Ball2 Brass
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vbsdf Ball2 -Kc 0 0 0
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vbsdf Ball2 -Kd 0.8 0.8 0.8
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vbsdf Ball2 -Ks 0 0 0
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vbsdf Ball2 -Kt 0 0 0
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vbsdf Ball2 -baseRoughness 0
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vbsdf Ball2 -coatRoughness 0
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vbsdf Ball2 -Le 2.02 0.171915 0.171915
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vbsdf Ball2 -absorpColor 0 0 0
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vbsdf Ball2 -absorpCoeff 0
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vbsdf Ball2 -coatFresnel Constant 0
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vbsdf Ball2 -baseFresnel Constant 1
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vlocation Ball2 -rotation 0 0 0 1
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vlocation Ball2 -location 10 40 0
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# Setup object 'Ball3'
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vdisplay Ball3
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vsetmaterial Ball3 Glass
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vbsdf Ball3 -Kc 1 1 1
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vbsdf Ball3 -Kd 0 0 0
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vbsdf Ball3 -Ks 0 0 0
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vbsdf Ball3 -Kt 1 1 1
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vbsdf Ball3 -baseRoughness 0
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vbsdf Ball3 -coatRoughness 0
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vbsdf Ball3 -Le 0 0 0
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vbsdf Ball3 -absorpColor 0.75 0.95 0.9
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vbsdf Ball3 -absorpCoeff 0.05
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vbsdf Ball3 -coatFresnel Dielectric 1.62
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vbsdf Ball3 -baseFresnel Constant 1
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vlocation Ball3 -rotation 0 0 0 1
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vlocation Ball3 -location -30 -40 0
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# Setup object 'Ball4'
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vdisplay Ball4
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vsetmaterial Ball4 Brass
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vbsdf Ball4 -Kc 0 0 0
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vbsdf Ball4 -Kd 0 0 0
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vbsdf Ball4 -Ks 0.985 0.985 0.985
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vbsdf Ball4 -Kt 0 0 0
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vbsdf Ball4 -baseRoughness 0
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vbsdf Ball4 -coatRoughness 0
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vbsdf Ball4 -Le 0 0 0
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vbsdf Ball4 -absorpColor 0 0 0
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vbsdf Ball4 -absorpCoeff 0
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vbsdf Ball4 -coatFresnel Constant 0
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vbsdf Ball4 -baseFresnel Schlick 0.58 0.42 0.2
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vlocation Ball4 -rotation 0 0 0 1
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vlocation Ball4 -location -70 -40 0
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# Setup object 'Ball5'
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vdisplay Ball5
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vsetmaterial Ball5 Glass
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vbsdf Ball5 -Kc 1 1 1
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vbsdf Ball5 -Kd 0 0 0
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vbsdf Ball5 -Ks 0 0 0
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vbsdf Ball5 -Kt 1 1 1
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vbsdf Ball5 -baseRoughness 0
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vbsdf Ball5 -coatRoughness 0
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vbsdf Ball5 -Le 0 0 0
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vbsdf Ball5 -absorpColor 0 0.288061 0.825532
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vbsdf Ball5 -absorpCoeff 0.3
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vbsdf Ball5 -coatFresnel Dielectric 1.62
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vbsdf Ball5 -baseFresnel Constant 1
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vlocation Ball5 -rotation 0 0 0 1
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vlocation Ball5 -location -30 0 0
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# Setup object 'Ball6'
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vdisplay Ball6
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vsetmaterial Ball6 Brass
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vbsdf Ball6 -Kc 1 1 1
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vbsdf Ball6 -Kd 0 0.716033 0.884507
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vbsdf Ball6 -Ks 0.115493 0.115493 0.115493
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vbsdf Ball6 -Kt 0 0 0
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vbsdf Ball6 -baseRoughness 0.045
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vbsdf Ball6 -coatRoughness 0
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vbsdf Ball6 -Le 0 0 0
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vbsdf Ball6 -absorpColor 0 0 0
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vbsdf Ball6 -absorpCoeff 0
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vbsdf Ball6 -coatFresnel Dielectric 1.5
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vbsdf Ball6 -baseFresnel Schlick 0.58 0.42 0.2
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vlocation Ball6 -rotation 0 0 0 1
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vlocation Ball6 -location -30 40 0
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# Setup object 'Ball7'
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vdisplay Ball7
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vsetmaterial Ball7 Brass
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vbsdf Ball7 -Kc 1 1 1
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vbsdf Ball7 -Kd 1e-06 9.9999e-07 9.9999e-07
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vbsdf Ball7 -Ks 0.0479573 0.804998 0
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vbsdf Ball7 -Kt 0 0 0
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vbsdf Ball7 -baseRoughness 0.447
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vbsdf Ball7 -coatRoughness 0
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vbsdf Ball7 -Le 0 0 0
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vbsdf Ball7 -absorpColor 0 0 0
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vbsdf Ball7 -absorpCoeff 0
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vbsdf Ball7 -coatFresnel Dielectric 1.5
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vbsdf Ball7 -baseFresnel Schlick 0.58 0.42 0.2
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vlocation Ball7 -rotation 0 0 0 1
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vlocation Ball7 -location -70 0 0
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# Setup object 'Ball8'
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vdisplay Ball8
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vsetmaterial Ball8 Aluminium
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vbsdf Ball8 -Kc 0 0 0
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vbsdf Ball8 -Kd 0 0 0
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vbsdf Ball8 -Ks 0.985 0.985 0.985
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vbsdf Ball8 -Kt 0 0 0
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vbsdf Ball8 -baseRoughness 0.026
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vbsdf Ball8 -coatRoughness 0
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vbsdf Ball8 -Le 0 0 0
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vbsdf Ball8 -absorpColor 0 0 0
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vbsdf Ball8 -absorpCoeff 0
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vbsdf Ball8 -coatFresnel Constant 0
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vbsdf Ball8 -baseFresnel Schlick 0.913183 0.921494 0.924524
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vlocation Ball8 -rotation 0 0 0 1
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vlocation Ball8 -location -70 40 0
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# Setup object 'Ball0'
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vdisplay Ball0
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vsetmaterial Ball0 Glass
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vbsdf Ball0 -Kc 0 0 0
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vbsdf Ball0 -Kd 0.723404 0.166229 0.166229
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vbsdf Ball0 -Ks 0 0 0
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vbsdf Ball0 -Kt 0 0 0
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vbsdf Ball0 -baseRoughness 0
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vbsdf Ball0 -coatRoughness 0
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vbsdf Ball0 -Le 0 0 0
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vbsdf Ball0 -absorpColor 0 0 0
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vbsdf Ball0 -absorpCoeff 0
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vbsdf Ball0 -coatFresnel Constant 0
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vbsdf Ball0 -baseFresnel Constant 1
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vlocation Ball0 -rotation 0 0 0 1
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vlocation Ball0 -location 10 -40 0
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# Restore view parameters
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vcamera -perspective -fovy 25
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vcamera -distance 238.089
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vviewparams -proj 0.679219 -0.00724546 0.7339
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vviewparams -up -0.733931 -0.00311795 0.679217
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vviewparams -at -22.3025 0.0986351 3.30327
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vviewparams -eye 139.412 -1.62643 178.037
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vviewparams -size 170.508
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# Restore light source parameters
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vlight clear
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vlight add directional direction -0.303949 -0.434084 -0.848048 smoothness 0.3 intensity 12
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# Load environment map
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vtextureenv on 1
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puts "Trying path tracing mode..."
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vrenderparams -ray -gi -rayDepth 10
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# Start progressive refinement mode
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#vprogressive
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puts "Make several path tracing iterations to refine the picture, please wait..."
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vfps 512
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puts "Done. To improve the image further, or after view manipulations, give command:"
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puts "vfps \[nb_iteratons\]"
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