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https://git.dev.opencascade.org/repos/occt.git
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a1073ae267
Weighted, Blended Order-Independent Transparency algorithm has been added rasterization pipeline. In contrast to classical blending transparency it makes transparent objects look independent from point of view. It also gives better depth occlusion when being used together with a weight factor based on value of a GL depth buffer. The feature supports desktop OpenGL, OpenGL ES 3.0, ANGLE and can be used together with MSAA on desktop GL. To be used it require availability of: 1) Shaders pipeline. 2) Floating point color format for framebuffer (GL_ARB_color_buffer_float). 3) Multiple render targets (GL_ARB_draw_buffers). Patch does not modify API and does not require application porting. It adds new rendering options to Graphic3d_RenderingParams structure: a) Transparency method from enumeration. b) Scalar factor [0-1] controlling influence of a fragment's depth to its visibility. Patch also simplifies processing of transparent objects for standard method: rendering priority of transparent graphical structures is managed automatically, therefore there is no need to care about it at application's side.
42 lines
1.0 KiB
Plaintext
42 lines
1.0 KiB
Plaintext
puts "========"
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puts "Transparency - check different blend operators"
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puts "========"
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# custom shapes
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set aShape1 [locate_data_file occ/Top.brep]
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set aShape2 [locate_data_file occ/Bottom.brep]
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vinit View1
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vsetdispmode 1
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vsetgradientbg 180 180 180 255 255 255 2
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restore $aShape1 s1
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restore $aShape2 s2
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vdisplay s1
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vdisplay s2
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vsettransparency s1 0.5
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vsettransparency s2 0.5
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# check blending artifacts
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vviewparams -scale 4.519 -at 93.051 -88.513 17.789 -eye -156.923 -151.929 6.147 -up -0.246 0.969 0.002
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vrenderparams -oit off
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vdump $imagedir/${casename}_blend_artifacts_unordered.png
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vrenderparams -oit 1.0
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vdump $imagedir/${casename}_blend_artifacts_oit.png
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# check depth occlusion
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vsetcolor s1 red
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vsetcolor s2 black
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vviewparams -scale 5.807 -at -59.913 -276.799 -4.312 -eye -69.465 -20.350 23.739 -up 0.999 0.038 -0.009
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vrenderparams -oit off
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vdump $imagedir/${casename}_occlusion_unordered.png
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vrenderparams -oit 0.0
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vdump $imagedir/${casename}_occlusion_oit_nodepth.png
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vrenderparams -oit 1.0
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vdump $imagedir/${casename}_occlusion_oit.png
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