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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
89 lines
2.2 KiB
Tcl
89 lines
2.2 KiB
Tcl
# Script demonstrating Global illumination effects using non-interactive
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# path tracing rendering engine in 3d view
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#Category: Visualization
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#Title: Path tracing - Cube
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pload MODELING VISUALIZATION
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# setup 3D viewer content
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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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# setup light sources
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vlight del 0
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vlight del 1
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vlight add positional head 0 pos 0.5 0.5 0.85
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vlight change 0 sm 0.06
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vlight change 0 int 30.0
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vvbo 0
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vsetdispmode 1
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vcamera -persp
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# setup outer box
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box b 1 1 1
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explode b FACE
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vdisplay -noupdate b_1 b_2 b_3 b_5 b_6
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vlocation -noupdate b_1 -setLocation 1 0 0
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vlocation -noupdate b_2 -setLocation -1 0 0
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vlocation -noupdate b_3 -setLocation 0 1 0
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vlocation -noupdate b_5 -setLocation 0 0 1
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vlocation -noupdate b_6 -setLocation 0 0 -1
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vsetmaterial -noupdate b_1 plastic
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vsetmaterial -noupdate b_2 plastic
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vsetmaterial -noupdate b_3 plastic
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vsetmaterial -noupdate b_5 plastic
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vsetmaterial -noupdate b_6 plastic
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vbsdf b_1 -kd 1 0.3 0.3 -ks 0
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vbsdf b_2 -kd 0.3 0.5 1 -ks 0
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vbsdf b_3 -kd 1 -ks 0
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vbsdf b_5 -kd 1 -ks 0
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vbsdf b_6 -kd 1 -ks 0
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vfront
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vfit
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# setup first inner sphere
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psphere s 0.2
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vdisplay -noupdate s
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vlocation -noupdate s -setLocation 0.21 0.3 0.2
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vsetmaterial -noupdate s glass
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vbsdf s -absorpColor 0.8 0.8 1.0
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vbsdf s -absorpCoeff 6
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# setup first inner box
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box c 0.3 0.3 0.2
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vdisplay -noupdate c
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vlocation -noupdate c -setLocation 0.55 0.3 0.0
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vlocation -noupdate c -rotate 0 0 0 0 0 1 -30
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vsetmaterial -noupdate c plastic
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vbsdf c -kd 1.0 0.8 0.2 -ks 0.3 -n
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# setup second inner box
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box g 0.15 0.15 0.3
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vdisplay -noupdate g
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vlocation -noupdate g -setLocation 0.7 0.25 0.2
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vlocation -noupdate g -rotate 0 0 0 0 0 1 10
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vsetmaterial -noupdate g glass
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vbsdf g -absorpColor 0.8 1.0 0.8
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vbsdf g -absorpCoeff 6
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# setup second inner sphere
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psphere r 0.1
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vdisplay -noupdate r
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vsetmaterial -noupdate r plastic
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vbsdf r -kd 0.5 0.9 0.3 -ks 0.3 -baseRoughness 0.0 -n
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vbsdf r -baseFresnel Constant 1.0
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vlocation r -setLocation 0.5 0.65 0.1
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puts "Trying path tracing mode..."
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vrenderparams -ray -gi -rayDepth 8
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puts "Make several path tracing iterations to refine the picture, please wait..."
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vfps 100
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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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