com.github.dabasan.jassimp.AiPostProcessSteps Maven / Gradle / Ivy
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package com.github.dabasan.jassimp;
import java.util.Set;
/**
* Enumerates the post processing steps supported by assimp.
*/
public enum AiPostProcessSteps {
/**
* Calculates the tangents and bitangents for the imported meshes.
*
*
* Does nothing if a mesh does not have normals. You might want this post
* processing step to be executed if you plan to use tangent space
* calculations such as normal mapping applied to the meshes. There's a
* config setting, #AI_CONFIG_PP_CT_MAX_SMOOTHING_ANGLE, which
* allows you to specify a maximum smoothing angle for the algorithm.
* However, usually you'll want to leave it at the default value.
*/
CALC_TANGENT_SPACE(0x1),
/**
* Identifies and joins identical vertex data sets within all imported
* meshes.
*
*
* After this step is run, each mesh contains unique vertices, so a vertex
* may be used by multiple faces. You usually want to use this post
* processing step. If your application deals with indexed geometry, this
* step is compulsory or you'll just waste rendering time. If this flag
* is not specified, no vertices are referenced by more than one face
* and no index buffer is required for rendering.
*/
JOIN_IDENTICAL_VERTICES(0x2),
/**
* Converts all the imported data to a left-handed coordinate space.
*
*
* By default the data is returned in a right-handed coordinate space (which
* OpenGL prefers). In this space, +X points to the right, +Z points towards
* the viewer, and +Y points upwards. In the DirectX coordinate space +X
* points to the right, +Y points upwards, and +Z points away from the
* viewer.
*
*
* You'll probably want to consider this flag if you use Direct3D for
* rendering. The #ConvertToLeftHanded flag supersedes this setting and
* bundles all conversions typically required for D3D-based applications.
*/
MAKE_LEFT_HANDED(0x4),
/**
* Triangulates all faces of all meshes.
*
*
* By default the imported mesh data might contain faces with more than 3
* indices. For rendering you'll usually want all faces to be triangles.
* This post processing step splits up faces with more than 3 indices into
* triangles. Line and point primitives are *not* modified! If you want
* 'triangles only' with no other kinds of primitives, try the following
* solution:
*
* - Specify both #Triangulate and #SortByPType
*
- Ignore all point and line meshes when you process assimp's output
*
*/
TRIANGULATE(0x8),
/**
* Removes some parts of the data structure (animations, materials, light
* sources, cameras, textures, vertex components).
*
*
* The components to be removed are specified in a separate configuration
* option, #AI_CONFIG_PP_RVC_FLAGS. This is quite useful if you
* don't need all parts of the output structure. Vertex colors are rarely
* used today for example... Calling this step to remove unneeded data from
* the pipeline as early as possible results in increased performance and a
* more optimized output data structure. This step is also useful if you
* want to force Assimp to recompute normals or tangents. The corresponding
* steps don't recompute them if they're already there (loaded from the
* source asset). By using this step you can make sure they are NOT there.
*
*
* This flag is a poor one, mainly because its purpose is usually
* misunderstood. Consider the following case: a 3D model has been exported
* from a CAD app, and it has per-face vertex colors. Vertex positions can't
* be shared, thus the #JoinIdenticalVertices step fails to optimize the
* data because of these nasty little vertex colors. Most apps don't even
* process them, so it's all for nothing. By using this step, unneeded
* components are excluded as early as possible thus opening more room for
* internal optimizations.
*/
REMOVE_COMPONENT(0x10),
/**
* Generates normals for all faces of all meshes.
*
*
* This is ignored if normals are already there at the time this flag is
* evaluated. Model importers try to load them from the source file, so
* they're usually already there. Face normals are shared between all points
* of a single face, so a single point can have multiple normals, which
* forces the library to duplicate vertices in some cases.
* #JoinIdenticalVertices is *senseless* then.
*
*
* This flag may not be specified together with {@link #GEN_SMOOTH_NORMALS}.
*/
GEN_NORMALS(0x20),
/**
* Generates smooth normals for all vertices in the mesh.
*
*
* This is ignored if normals are already there at the time this flag is
* evaluated. Model importers try to load them from the source file, so
* they're usually already there.
*
*
* This flag may not be specified together with {@link #GEN_NORMALS} There's
* a configuration option, #AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE
* which allows you to specify an angle maximum for the normal smoothing
* algorithm. Normals exceeding this limit are not smoothed, resulting in a
* 'hard' seam between two faces. Using a decent angle here (e.g. 80
* degrees) results in very good visual appearance.
*/
GEN_SMOOTH_NORMALS(0x40),
/**
* Splits large meshes into smaller sub-meshes.
*
*
* This is quite useful for real-time rendering, where the number of
* triangles which can be maximally processed in a single draw-call is
* limited by the video driver/hardware. The maximum vertex buffer is
* usually limited too. Both requirements can be met with this step: you may
* specify both a triangle and vertex limit for a single mesh.
*
*
* The split limits can (and should!) be set through the
* #AI_CONFIG_PP_SLM_VERTEX_LIMIT and
* #AI_CONFIG_PP_SLM_TRIANGLE_LIMIT settings. The default values
* are #AI_SLM_DEFAULT_MAX_VERTICES and
* #AI_SLM_DEFAULT_MAX_TRIANGLES.
*
*
* Note that splitting is generally a time-consuming task, but only if
* there's something to split. The use of this step is recommended for most
* users.
*/
SPLIT_LARGE_MESHES(0x80),
/**
* Removes the node graph and pre-transforms all vertices with the local
* transformation matrices of their nodes.
*
*
* The output scene still contains nodes, however there is only a root node
* with children, each one referencing only one mesh, and each mesh
* referencing one material. For rendering, you can simply render all meshes
* in order - you don't need to pay attention to local transformations and
* the node hierarchy. Animations are removed during this step. This step is
* intended for applications without a scenegraph. The step CAN cause some
* problems: if e.g. a mesh of the asset contains normals and another, using
* the same material index, does not, they will be brought together, but the
* first meshes's part of the normal list is zeroed. However, these
* artifacts are rare.
*
*
* Note: The #AI_CONFIG_PP_PTV_NORMALIZE configuration
* property can be set to normalize the scene's spatial dimension to the
* -1...1 range.
*/
PRE_TRANSFORM_VERTICES(0x100),
/**
* Limits the number of bones simultaneously affecting a single vertex to a
* maximum value.
*
*
* If any vertex is affected by more than the maximum number of bones, the
* least important vertex weights are removed and the remaining vertex
* weights are renormalized so that the weights still sum up to 1. The
* default bone weight limit is 4 (defined as #AI_LMW_MAX_WEIGHTS
* in config.h), but you can use the #AI_CONFIG_PP_LBW_MAX_WEIGHTS
* setting to supply your own limit to the post processing step.
*
*
* If you intend to perform the skinning in hardware, this post processing
* step might be of interest to you.
*/
LIMIT_BONE_WEIGHTS(0x200),
/**
* Validates the imported scene data structure. This makes sure that all
* indices are valid, all animations and bones are linked correctly, all
* material references are correct .. etc.
*
*
* It is recommended that you capture Assimp's log output if you use this
* flag, so you can easily find out what's wrong if a file fails the
* validation. The validator is quite strict and will find *all*
* inconsistencies in the data structure... It is recommended that plugin
* developers use it to debug their loaders. There are two types of
* validation failures:
*
* - Error: There's something wrong with the imported data. Further
* postprocessing is not possible and the data is not usable at all. The
* import fails. #Importer::GetErrorString() or #aiGetErrorString() carry
* the error message around.
* - Warning: There are some minor issues (e.g. 1000000 animation
* keyframes with the same time), but further postprocessing and use of the
* data structure is still safe. Warning details are written to the log
* file, #AI_SCENE_FLAGS_VALIDATION_WARNING is set in
* #aiScene::mFlags
*
*
* This post-processing step is not time-consuming. Its use is not
* compulsory, but recommended.
*/
VALIDATE_DATA_STRUCTURE(0x400),
/**
* Reorders triangles for better vertex cache locality.
*
*
* The step tries to improve the ACMR (average post-transform vertex cache
* miss ratio) for all meshes. The implementation runs in O(n) and is
* roughly based on the 'tipsify' algorithm (see this
* paper).
*
*
* If you intend to render huge models in hardware, this step might be of
* interest to you. The #AI_CONFIG_PP_ICL_PTCACHE_SIZEconfig
* setting can be used to fine-tune the cache optimization.
*/
IMPROVE_CACHE_LOCALITY(0x800),
/**
* Searches for redundant/unreferenced materials and removes them.
*
*
* This is especially useful in combination with the #PretransformVertices
* and #OptimizeMeshes flags. Both join small meshes with equal
* characteristics, but they can't do their work if two meshes have
* different materials. Because several material settings are lost during
* Assimp's import filters, (and because many exporters don't check for
* redundant materials), huge models often have materials which are are
* defined several times with exactly the same settings.
*
*
* Several material settings not contributing to the final appearance of a
* surface are ignored in all comparisons (e.g. the material name). So, if
* you're passing additional information through the content pipeline
* (probably using *magic* material names), don't specify this flag.
* Alternatively take a look at the #AI_CONFIG_PP_RRM_EXCLUDE_LIST
* setting.
*/
REMOVE_REDUNDANT_MATERIALS(0x1000),
/**
* This step tries to determine which meshes have normal vectors that are
* facing inwards and inverts them.
*
*
* The algorithm is simple but effective: the bounding box of all vertices +
* their normals is compared against the volume of the bounding box of all
* vertices without their normals. This works well for most objects,
* problems might occur with planar surfaces. However, the step tries to
* filter such cases. The step inverts all in-facing normals. Generally it
* is recommended to enable this step, although the result is not always
* correct.
*/
FIX_INFACING_NORMALS(0x2000),
/**
* This step splits meshes with more than one primitive type in homogeneous
* sub-meshes.
*
*
* The step is executed after the triangulation step. After the step
* returns, just one bit is set in aiMesh::mPrimitiveTypes. This is
* especially useful for real-time rendering where point and line primitives
* are often ignored or rendered separately. You can use the
* #AI_CONFIG_PP_SBP_REMOVE option to specify which primitive types
* you need. This can be used to easily exclude lines and points, which are
* rarely used, from the import.
*/
SORT_BY_PTYPE(0x8000),
/**
* This step searches all meshes for degenerate primitives and converts them
* to proper lines or points.
*
*
* A face is 'degenerate' if one or more of its points are identical. To
* have the degenerate stuff not only detected and collapsed but removed,
* try one of the following procedures:
* 1. (if you support lines and points for rendering but don't want
* the degenerates)
*
* - Specify the #FindDegenerates flag.
* - Set the AI_CONFIG_PP_FD_REMOVE option to 1. This will cause
* the step to remove degenerate triangles from the import as soon as
* they're detected. They won't pass any further pipeline steps.
*
*
* 2.(if you don't support lines and points at all)
*
* - Specify the #FindDegenerates flag.
*
- Specify the #SortByPType flag. This moves line and point primitives
* to separate meshes.
*
- Set the AI_CONFIG_PP_SBP_REMOVE option to
*
aiPrimitiveType_POINTS | aiPrimitiveType_LINES to cause
* SortByPType to reject point and line meshes from the scene.
*
* Note: Degenerated polygons are not necessarily evil and that's why
* they're not removed by default. There are several file formats which
* don't support lines or points, and some exporters bypass the format
* specification and write them as degenerate triangles instead.
*/
FIND_DEGENERATES(0x10000),
/**
* This step searches all meshes for invalid data, such as zeroed normal
* vectors or invalid UV coords and removes/fixes them. This is intended to
* get rid of some common exporter errors.
*
*
* This is especially useful for normals. If they are invalid, and the step
* recognizes this, they will be removed and can later be recomputed, i.e.
* by the {@link #GEN_SMOOTH_NORMALS} flag.
*
*
* The step will also remove meshes that are infinitely small and reduce
* animation tracks consisting of hundreds if redundant keys to a single
* key. The AI_CONFIG_PP_FID_ANIM_ACCURACY config property decides
* the accuracy of the check for duplicate animation tracks.
*/
FIND_INVALID_DATA(0x20000),
/**
* This step converts non-UV mappings (such as spherical or cylindrical
* mapping) to proper texture coordinate channels.
*
*
* Most applications will support UV mapping only, so you will probably want
* to specify this step in every case. Note that Assimp is not always able
* to match the original mapping implementation of the 3D app which produced
* a model perfectly. It's always better to let the modelling app compute
* the UV channels - 3ds max, Maya, Blender, LightWave, and Modo do this for
* example.
*
*
* Note: If this step is not requested, you'll need to process the
* MATKEY_MAPPING material property in order to display all assets
* properly.
*/
GEN_UV_COORDS(0x40000),
/**
* This step applies per-texture UV transformations and bakes them into
* stand-alone vtexture coordinate channels.
*
*
* UV transformations are specified per-texture - see the
* MATKEY_UVTRANSFORM material key for more information. This step
* processes all textures with transformed input UV coordinates and
* generates a new (pre-transformed) UV channel which replaces the old
* channel. Most applications won't support UV transformations, so you will
* probably want to specify this step.
*
*
* Note: UV transformations are usually implemented in real-time apps
* by transforming texture coordinates at vertex shader stage with a 3x3
* (homogenous) transformation matrix.
*/
TRANSFORM_UV_COORDS(0x80000),
/**
* This step searches for duplicate meshes and replaces them with references
* to the first mesh.
*
*
* This step takes a while, so don't use it if speed is a concern. Its main
* purpose is to workaround the fact that many export file formats don't
* support instanced meshes, so exporters need to duplicate meshes. This
* step removes the duplicates again. Please note that Assimp does not
* currently support per-node material assignment to meshes, which means
* that identical meshes with different materials are currently *not*
* joined, although this is planned for future versions.
*/
FIND_INSTANCES(0x100000),
/**
* A postprocessing step to reduce the number of meshes.
*
*
* This will, in fact, reduce the number of draw calls.
*
*
* This is a very effective optimization and is recommended to be used
* together with #OptimizeGraph, if possible. The flag is fully compatible
* with both {@link #SPLIT_LARGE_MESHES} and {@link #SORT_BY_PTYPE}.
*/
OPTIMIZE_MESHES(0x200000),
/**
* A postprocessing step to optimize the scene hierarchy.
*
*
* Nodes without animations, bones, lights or cameras assigned are collapsed
* and joined.
*
*
* Node names can be lost during this step. If you use special 'tag nodes'
* to pass additional information through your content pipeline, use the
* #AI_CONFIG_PP_OG_EXCLUDE_LIST setting to specify a list of node
* names you want to be kept. Nodes matching one of the names in this list
* won't be touched or modified.
*
*
* Use this flag with caution. Most simple files will be collapsed to a
* single node, so complex hierarchies are usually completely lost. This is
* not useful for editor environments, but probably a very effective
* optimization if you just want to get the model data, convert it to your
* own format, and render it as fast as possible.
*
*
* This flag is designed to be used with #OptimizeMeshes for best results.
*
*
* Note: 'Crappy' scenes with thousands of extremely small meshes
* packed in deeply nested nodes exist for almost all file formats.
* {@link #OPTIMIZE_MESHES} in combination with {@link #OPTIMIZE_GRAPH}
* usually fixes them all and makes them renderable.
*/
OPTIMIZE_GRAPH(0x400000),
/**
* This step flips all UV coordinates along the y-axis and adjusts material
* settings and bitangents accordingly.
*
*
* Output UV coordinate system:
*
* 0y|0y ---------- 1x|0y
* | |
* | |
* | |
* 0x|1y ---------- 1x|1y
*
*
* You'll probably want to consider this flag if you use Direct3D for
* rendering. The {@link #MAKE_LEFT_HANDED} flag supersedes this setting and
* bundles all conversions typically required for D3D-based applications.
*/
FLIP_UVS(0x800000),
/**
* This step adjusts the output face winding order to be CW.
*
*
* The default face winding order is counter clockwise (CCW).
*
* Output face order:
*
*
* x2
*
* x0
* x1
*
*/
SPLIT_BY_BONE_COUNT(0x2000000),
/**
* This step removes bones losslessly or according to some threshold.
*
*
* In some cases (i.e. formats that require it) exporters are forced to
* assign dummy bone weights to otherwise static meshes assigned to animated
* meshes. Full, weight-based skinning is expensive while animating nodes is
* extremely cheap, so this step is offered to clean up the data in that
* regard.
*
*
* Use #AI_CONFIG_PP_DB_THRESHOLD to control this. Use
* #AI_CONFIG_PP_DB_ALL_OR_NONE if you want bones removed if and
* only if all bones within the scene qualify for removal.
*/
DEBONE(0x4000000);
/**
* Utility method for converting to c/c++ based integer enums from java
* enums.
*
*
* This method is intended to be used from JNI and my change based on
* implementation needs.
*
* @param set
* the set to convert
* @return an integer based enum value (as defined by assimp)
*/
static long toRawValue(Set set) {
long rawValue = 0L;
for (final AiPostProcessSteps step : set) {
rawValue |= step.m_rawValue;
}
return rawValue;
}
/**
* Constructor.
*
* @param rawValue
* maps java enum to c/c++ integer enum values
*/
private AiPostProcessSteps(long rawValue) {
m_rawValue = rawValue;
}
/**
* The mapped c/c++ integer enum value.
*/
private final long m_rawValue;
}