[OpenSCAD] Preview working but render fails for difference()

nop head nop.head at gmail.com
Tue Oct 2 07:55:56 EDT 2018


Yes it does seem to be a bug. Preview is correct. The render includes the
negative objects and so does the exported STL, which is then not manifold
according to NetFabb.

[image: image.png]

I can't find anything wrong with the original STL but it seems to confuse
GGAL.

Even weirder things happen if I union the STL with large cube([400,100,
20], center = true) in MyImport();

Then the cube gets subtracted and the cylinders added. It's like difference
is working backwards. I wonder if the original  STL is inside out and
NetFabb doesn't tell me?




On Tue, 2 Oct 2018 at 12:10, Experimentalist <
experimentalist at aaawesome.co.uk> wrote:

> I am having an issue where a part will preview satisfactorily but renders
> incorrectly. It has similarities to this issue:
>
> https://github.com/openscad/openscad/issues/1591
>
> I have tried on two different Dell PCs, one Optiplex 7010 and the other a
> Latitude E6530. Both have Intel HD Graphics 4000 cards. I am using the most
> up to date graphics drivers I can get to install.
>
> I have tried using both these versions:
>
> OpenSCAD version 2015.03-2
> OpenSCAD version 2018.09.05 (git 40af343)
>
> Reading the above issue I have tried with and without the "Force
> Goldfeather
> setting having no success either way with either version
>
> I have attached the files needed to replicate the issue:
>
> Modify.scad <http://forum.openscad.org/file/t1222/Modify.scad>
> Holder_re-rendered_using_OpenSCAD.stl
> <
> http://forum.openscad.org/file/t1222/Holder_re-rendered_using_OpenSCAD.stl>
>
> Holder_as_rendered.stl
> <http://forum.openscad.org/file/t1222/Holder_as_rendered.stl>
>
> Here is the library info for the OPtiplex 7010 using OpenSCAD version
> 2018.09.05 (git 40af343) :
>
> OpenSCAD Version: 2018.09.05 (git 40af343)
> System information: Windows(TM) 10.0 SP 0.0 NTW 1 MSDN 724833 4 CPUs 3.89
> GB
> RAM
> Compiler: GCC "7.3.0" 64bit
> Boost version: 1_60
> Eigen version: 3.2.5
> CGAL version, kernels: 4.11, Cartesian, Extended_cartesian, Epeck
> OpenCSG version: OpenCSG 1.4.2
> Qt version: 5.11.1
> QScintilla version: 2.10.4
> MingW build: MingW64
> GLib version: 2.50.2
> libzip version: 1.5.1
> Application Path: C:/Program Files/OpenSCAD
> Documents Path: C:\Users\Andy\Documents
> Resource Path: C:/Program Files/OpenSCAD
> User Library Path: C:/Users/Andy/Documents/OpenSCAD/libraries
> User Config Path: C:\Users\Andy\AppData\Local/OpenSCAD
> Backup Path: C:/Users/Andy/Documents/OpenSCAD/backups
> OPENSCADPATH:
> OpenSCAD library path:
> C:/Users/Andy/Documents/OpenSCAD/libraries
> C:/Program Files/OpenSCAD\libraries
>
> OPENSCAD_FONT_PATH:
> OpenSCAD font path:
> GLEW version: 1.12.0
> OpenGL Version: 4.0.0 - Build 10.18.10.4885
> GL Renderer: Intel(R) HD Graphics 4000
> GL Vendor: Intel
> RGBA(8888), depth(24), stencil(8)
> GL_ARB_framebuffer_object: yes
> GL_EXT_framebuffer_object: yes
> GL_EXT_packed_depth_stencil: yes
>
> Qt graphics widget: QGLWidgetGL Extensions:
> GL_3DFX_texture_compression_FXT1
> GL_ARB_ES2_compatibility
> GL_ARB_ES3_compatibility
> GL_ARB_arrays_of_arrays
> GL_ARB_base_instance
> GL_ARB_blend_func_extended
> GL_ARB_buffer_storage
> GL_ARB_color_buffer_float
> GL_ARB_compatibility
> GL_ARB_compressed_texture_pixel_storage
> GL_ARB_conservative_depth
> GL_ARB_copy_buffer
> GL_ARB_debug_output
> GL_ARB_depth_buffer_float
> GL_ARB_depth_clamp
> GL_ARB_depth_texture
> GL_ARB_draw_buffers
> GL_ARB_draw_buffers_blend
> GL_ARB_draw_elements_base_vertex
> GL_ARB_draw_indirect
> GL_ARB_draw_instanced
> GL_ARB_explicit_attrib_location
> GL_ARB_fragment_coord_conventions
> GL_ARB_fragment_program
> GL_ARB_fragment_program_shadow
> GL_ARB_fragment_shader
> GL_ARB_framebuffer_no_attachments
> GL_ARB_framebuffer_object
> GL_ARB_framebuffer_sRGB
> GL_ARB_geometry_shader4
> GL_ARB_get_program_binary
> GL_ARB_gpu_shader5
> GL_ARB_gpu_shader_fp64
> GL_ARB_half_float_pixel
> GL_ARB_half_float_vertex
> GL_ARB_instanced_arrays
> GL_ARB_internalformat_query
> GL_ARB_internalformat_query2
> GL_ARB_map_buffer_alignment
> GL_ARB_map_buffer_range
> GL_ARB_multi_draw_indirect
> GL_ARB_multisample
> GL_ARB_multitexture
> GL_ARB_occlusion_query
> GL_ARB_occlusion_query2
> GL_ARB_pixel_buffer_object
> GL_ARB_point_parameters
> GL_ARB_point_sprite
> GL_ARB_program_interface_query
> GL_ARB_provoking_vertex
> GL_ARB_robustness
> GL_ARB_sample_shading
> GL_ARB_sampler_objects
> GL_ARB_seamless_cube_map
> GL_ARB_separate_shader_objects
> GL_ARB_shader_atomic_counters
> GL_ARB_shader_bit_encoding
> GL_ARB_shader_objects
> GL_ARB_shader_precision
> GL_ARB_shader_subroutine
> GL_ARB_shading_language_100
> GL_ARB_shading_language_420pack
> GL_ARB_shading_language_packing
> GL_ARB_shadow
> GL_ARB_stencil_texturing
> GL_ARB_sync
> GL_ARB_tessellation_shader
> GL_ARB_texture_border_clamp
> GL_ARB_texture_buffer_object_rgb32
> GL_ARB_texture_buffer_range
> GL_ARB_texture_compression
> GL_ARB_texture_compression_bptc
> GL_ARB_texture_compression_rgtc
> GL_ARB_texture_cube_map
> GL_ARB_texture_cube_map_array
> GL_ARB_texture_env_add
> GL_ARB_texture_env_combine
> GL_ARB_texture_env_crossbar
> GL_ARB_texture_env_dot3
> GL_ARB_texture_float
> GL_ARB_texture_gather
> GL_ARB_texture_multisample
> GL_ARB_texture_non_power_of_two
> GL_ARB_texture_query_lod
> GL_ARB_texture_rectangle
> GL_ARB_texture_rg
> GL_ARB_texture_rgb10_a2ui
> GL_ARB_texture_storage
> GL_ARB_texture_storage_multisample
> GL_ARB_texture_swizzle
> GL_ARB_timer_query
> GL_ARB_transform_feedback2
> GL_ARB_transform_feedback3
> GL_ARB_transform_feedback_instanced
> GL_ARB_transpose_matrix
> GL_ARB_uniform_buffer_object
> GL_ARB_vertex_array_bgra
> GL_ARB_vertex_array_object
> GL_ARB_vertex_attrib_64bit
> GL_ARB_vertex_attrib_binding
> GL_ARB_vertex_buffer_object
> GL_ARB_vertex_program
> GL_ARB_vertex_shader
> GL_ARB_vertex_type_2_10_10_10_rev
> GL_ARB_viewport_array
> GL_ARB_window_pos
> GL_ATI_separate_stencil
> GL_EXT_abgr
> GL_EXT_bgra
> GL_EXT_blend_color
> GL_EXT_blend_equation_separate
> GL_EXT_blend_func_separate
> GL_EXT_blend_minmax
> GL_EXT_blend_subtract
> GL_EXT_clip_volume_hint
> GL_EXT_compiled_vertex_array
> GL_EXT_draw_buffers2
> GL_EXT_draw_range_elements
> GL_EXT_fog_coord
> GL_EXT_framebuffer_blit
> GL_EXT_framebuffer_multisample
> GL_EXT_framebuffer_object
> GL_EXT_geometry_shader4
> GL_EXT_gpu_program_parameters
> GL_EXT_gpu_shader4
> GL_EXT_multi_draw_arrays
> GL_EXT_packed_depth_stencil
> GL_EXT_packed_float
> GL_EXT_packed_pixels
> GL_EXT_rescale_normal
> GL_EXT_secondary_color
> GL_EXT_separate_specular_color
> GL_EXT_shader_integer_mix
> GL_EXT_shadow_funcs
> GL_EXT_stencil_two_side
> GL_EXT_stencil_wrap
> GL_EXT_texture3D
> GL_EXT_texture_array
> GL_EXT_texture_buffer
> GL_EXT_texture_compression_s3tc
> GL_EXT_texture_edge_clamp
> GL_EXT_texture_env_add
> GL_EXT_texture_env_combine
> GL_EXT_texture_filter_anisotropic
> GL_EXT_texture_integer
> GL_EXT_texture_lod_bias
> GL_EXT_texture_rectangle
> GL_EXT_texture_sRGB
> GL_EXT_texture_sRGB_decode
> GL_EXT_texture_shared_exponent
> GL_EXT_texture_snorm
> GL_EXT_texture_storage
> GL_EXT_texture_swizzle
> GL_EXT_transform_feedback
> GL_IBM_texture_mirrored_repeat
> GL_INTEL_map_texture
> GL_INTEL_performance_queries
> GL_INTEL_performance_query
> GL_KHR_blend_equation_advanced
> GL_KHR_debug
> GL_NV_blend_square
> GL_NV_conditional_render
> GL_NV_primitive_restart
> GL_NV_texgen_reflection
> GL_SGIS_generate_mipmap
> GL_SGIS_texture_edge_clamp
> GL_SGIS_texture_lod
> GL_SUN_multi_draw_arrays
> GL_WIN_swap_hint
> WGL_ARB_buffer_region
> WGL_ARB_create_context
> WGL_ARB_create_context_profile
> WGL_ARB_create_context_robustness
> WGL_ARB_extensions_string
> WGL_ARB_framebuffer_sRGB
> WGL_ARB_make_current_read
> WGL_ARB_multisample
> WGL_ARB_pbuffer
> WGL_ARB_pixel_format
> WGL_ARB_pixel_format_float
> WGL_EXT_create_context_es2_profile
> WGL_EXT_create_context_es_profile
> WGL_EXT_depth_float
> WGL_EXT_extensions_string
> WGL_EXT_pixel_format_packed_float
> WGL_EXT_swap_control
> WGL_EXT_swap_control_tear
> WGL_NV_DX_interop
>
> Any ideas on what I could try?
>
>
>
> --
> Sent from: http://forum.openscad.org/
>
> _______________________________________________
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