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成都移动网站建设,wordpress主机怎么建站,网站内容避免被采集,太原优化排名推广一#xff1a;主要的知识点 1、说明 本文只是教程内容的一小段#xff0c;因博客字数限制#xff0c;故进行拆分。主教程链接#xff1a;vtk教程——逐行解析官网所有Python示例-CSDN博客 2、知识点纪要 本段代码主要涉及的有①纹理的伽马校正#xff0c;②清漆层 二主要的知识点1、说明本文只是教程内容的一小段因博客字数限制故进行拆分。主教程链接vtk教程——逐行解析官网所有Python示例-CSDN博客2、知识点纪要本段代码主要涉及的有①纹理的伽马校正②清漆层二代码及注释import json from pathlib import Path from vtkmodules.vtkRenderingCore import vtkPolyDataMapper, vtkActor from vtkmodules.vtkCommonColor import vtkNamedColors from vtkmodules.vtkRenderingOpenGL2 import vtkOpenGLRenderer from vtkmodules.vtkRenderingCore import vtkLight, vtkRenderWindow, vtkRenderWindowInteractor, vtkSkybox, vtkTexture from vtkmodules.vtkInteractionStyle import vtkInteractorStyleTrackballCamera from vtkmodules.vtkIOImage import vtkImageReader2Factory, vtkHDRReader, vtkPNGReader from vtkmodules.vtkImagingCore import vtkImageFlip from vtkmodules.vtkFiltersSources import vtkCubeSource from vtkmodules.vtkFiltersCore import vtkTriangleFilter, vtkPolyDataTangents def get_parameters(fn_path): Read the parameters from a JSON file and check that the file paths exist. :param fn_path: The path to the JSON file. :return: True if the paths correspond to files and the parameters. with open(fn_path) as data_file: json_data json.load(data_file) parameters dict() # Extract the values. keys_no_paths {title, object, objcolor, bkgcolor, skybox} keys_with_paths {cubemap, equirectangular, albedo, normal, material, coat, anisotropy, emissive} paths_ok True for k, v in json_data.items(): if k in keys_no_paths: parameters[k] v continue if k in keys_with_paths: if k cubemap: if (root in v) and (files in v): root Path(v[root]) if not root.exists(): print(fBad cubemap path: {root}) paths_ok False elif len(v[files]) ! 6: print(fExpect six cubemap file names.) paths_ok False else: cm list(map(lambda p: root / p, v[files])) for fn in cm: if not fn.is_file(): paths_ok False print(fNot a file {fn}) if paths_ok: parameters[cubemap] cm else: paths_ok False print(Missing the key root and/or the key fíles for the cubemap.) else: fn Path(v) if not fn.exists(): print(fBad {k} path: {fn}) paths_ok False else: parameters[k] fn # Set Boy as the default surface. if (object in parameters.keys() and not parameters[object]) or object not in parameters.keys(): parameters[object] Boy return paths_ok, parameters def read_cubemap(cubemap): cube_map vtkTexture() cube_map.CubeMapOn() i 0 for fn in cubemap: reader_factory vtkImageReader2Factory() img_reader reader_factory.CreateImageReader2(str(fn)) img_reader.SetFileName(str(fn)) flip vtkImageFlip() flip.SetInputConnection(img_reader.GetOutputPort()) flip.SetFilteredAxis(1) cube_map.SetInputConnection(i, flip.GetOutputPort()) cube_map.MipmapOn() cube_map.InterpolateOn() return cube_map def read_equirectangular_file(fn_path): texture vtkTexture() suffix fn_path.suffix.lower() if suffix in [.jpeg, .jpg, .png]: read_factory vtkImageReader2Factory() reader read_factory.CreateImageReader2(str(fn_path)) reader.SetFileName(str(fn_path)) texture.SetInputConnection(reader.GetOutputPort()) else: reader vtkHDRReader() reader.SetFileName(str(fn_path)) texture.SetColorModeToDirectScalars() texture.SetInputConnection(reader.GetOutputPort()) texture.MipmapOn() texture.InterpolateOn() return texture def main(): fn Data/PBR_Parameters.json use_cubemap False paths_ok, parameters get_parameters(fn) colors vtkNamedColors() ren vtkOpenGLRenderer() ren.SetBackground(colors.GetColor3d(Black)) AutomaticLightCreationOff 禁用渲染器的自动光照创建机制 在 VTK 中为了让用户即使不手动添加光源也能看到3D模型会先检查是否有光源没有就会自动创建一个防止场景一片漆黑 ren.AutomaticLightCreationOff() light vtkLight() light.SetPosition(2.0, 0.0, 2.0) light.SetFocalPoint(0.0, 0.0, 0.0) ren.AddLight(light) ren_win vtkRenderWindow() ren_win.SetSize(600, 600) ren_win.AddRenderer(ren) iren vtkRenderWindowInteractor() iren.SetRenderWindow(ren_win) style vtkInteractorStyleTrackballCamera() iren.SetInteractorStyle(style) irradiance ren.GetEnvMapIrradiance() irradiance.SetIrradianceStep(0.3) skybox vtkSkybox() is_hdr False has_skybox False gamma_correct False if use_cubemap and cubemap in parameters.keys(): env_texture read_cubemap(parameters[cubemap]) if parameters[skybox]: skybox.SetTexture(env_texture) elif equirectangular in parameters.keys(): env_texture read_equirectangular_file(parameters[equirectangular]) if parameters[equirectangular].suffix.lower() in .hdr .pic: gamma_correct True is_hdr True if parameters[skybox]: skybox.SetFloorRight(0, 0, 1) skybox.SetProjection(vtkSkybox.Sphere) skybox.SetTexture(env_texture) has_skybox True else: return ren.UseImageBasedLightingOn() if is_hdr: ren.UseSphericalHarmonicsOn() ren.SetEnvironmentTexture(env_texture, False) else: ren.UseSphericalHarmonicsOff() ren.SetEnvironmentTexture(env_texture, True) cube vtkCubeSource() triangulation vtkTriangleFilter() triangulation.SetInputConnection(cube.GetOutputPort()) tangents vtkPolyDataTangents() tangents.SetInputConnection(triangulation.GetOutputPort()) mapper vtkPolyDataMapper() mapper.SetInputConnection(tangents.GetOutputPort()) # 读取cube的表面的材质的照片 material_reader vtkPNGReader() material_reader.SetFileName(parameters[material]) material vtkTexture() material.InterpolateOn() material.SetInputConnection(material_reader.GetOutputPort()) # 颜色贴图的读取 albedo_reader vtkPNGReader() albedo_reader.SetFileName(parameters[albedo]) albedo vtkTexture() UseSRGBColorSpaceOn 这是 PBR 中最关键的设置之一等同于对纹理进行输入伽马校正 大多数颜色贴图包括 Albedo 贴图都是在非线性的 sRGB 颜色空间中保存的。但是渲染器内部的光照计算必须在线性空间中进行才能保证物理准确性 这确保了物体的基础颜色在渲染时不会显得过亮或过暗 albedo.UseSRGBColorSpaceOn() albedo.InterpolateOn() albedo.SetInputConnection(albedo_reader.GetOutputPort()) # 法相贴图的读取 normal_reader vtkPNGReader() normal_reader.SetFileName(parameters[normal]) normal vtkTexture() normal.InterpolateOn() normal.SetInputConnection(normal_reader.GetOutputPort()) # 作用于清漆层(Clear Coat)的法线贴图 清漆层Coat Layer是指覆盖在主体材质Base Material之上的一层薄而透明的保护层 现实世界示例: 汽车漆最外层的透明保护漆、家具上的清漆/光油、带有釉面的陶瓷。 物理效果: 清漆层有自己的反射和粗糙度属性它会独立地产生一次反射高光并且这层反射是半透明的 因此光线会穿透它击中下方的基础材质再产生第二次反射漫反射和基础反射。 coat_normal就是一张法线贴图但它只应用于最外面的清漆层 coat_normal vtkTexture() coat_normal.InterpolateOn() coat_normal.SetInputConnection(normal_reader.GetOutputPort()) actor vtkActor() actor.SetOrientation(0.0, 25.0, 0.0) actor.SetMapper(mapper) actor.GetProperty().SetInterpolationToPBR() actor.GetProperty().SetMetallic(1.0) actor.GetProperty().SetRoughness(1.0) SetCoatStrength 启用并设置清漆层的强度为 1.0最大强度。这模拟了物体表面覆盖着一层透明的保护漆或釉面。 actor.GetProperty().SetCoatStrength(1.0) SetCoatColor 定义清漆层的高光颜色。在这里设置为 Red意味着清漆层反射的光线会带有红色调模拟一些特殊的着色清漆。 actor.GetProperty().SetCoatColor(colors.GetColor3d(Red)) SetBaseColorTexture 用于定义物体表面的基础颜色。这是材质的“底色”。 actor.GetProperty().SetBaseColorTexture(albedo) SetORMTexture 设置材质属性通常一个3D模型的材质属性会存储在三原色通道中 - R 通道: Occlusion (环境光遮蔽) - G 通道: Roughness (粗糙度) - B 通道: Metallic (金属性) actor.GetProperty().SetORMTexture(material) SetNormalTexture 添加法线贴图 actor.GetProperty().SetNormalTexture(normal) SetCoatNormalTexture 清漆层法线贴图 actor.GetProperty().SetCoatNormalTexture(coat_normal) ren.AddActor(actor) if has_skybox: if gamma_correct: skybox.GammaCorrectOn() else: skybox.GammaCorrectOff() ren.AddActor(skybox) ren_win.SetWindowName(PBR_Clear_Coat) ren_win.Render() ren.GetActiveCamera().Zoom(1.5) iren.Start() if __name__ __main__: main()