shaders#

Module: shaders.base#

SHADERS_DIR

str(object='') -> str str(bytes_or_buffer[, encoding[, errors]]) -> str

compose_shader(glsl_code)

Merge GLSL shader code from a list of strings.

import_fury_shader(shader_file)

Import a Fury shader.

load_shader(shader_file)

Load a shader from a file.

load(filename)

Load a Fury shader file.

shader_to_actor(actor, shader_type[, ...])

Apply your own substitutions to the shader creation process.

replace_shader_in_actor(actor, shader_type, code)

Set and replace the shader template with a new one.

add_shader_callback(actor, callback[, priority])

Add a shader callback to the actor.

shader_apply_effects(window, actor, effects)

This applies a specific opengl state (effect) or a list of effects just before the actor's shader is executed.

attribute_to_actor(actor, arr, attr_name[, deep])

Link a numpy array with vertex attribute.

SHADERS_DIR#

fury.shaders.base.SHADERS_DIR()#

str(object=’’) -> str str(bytes_or_buffer[, encoding[, errors]]) -> str

Create a new string object from the given object. If encoding or errors is specified, then the object must expose a data buffer that will be decoded using the given encoding and error handler. Otherwise, returns the result of object.__str__() (if defined) or repr(object). encoding defaults to sys.getdefaultencoding(). errors defaults to ‘strict’.

compose_shader#

fury.shaders.base.compose_shader(glsl_code)[source]#

Merge GLSL shader code from a list of strings.

Parameters:

glsl_code (list of str (code or filenames).) –

Returns:

code – GLSL shader code.

Return type:

str

import_fury_shader#

fury.shaders.base.import_fury_shader(shader_file)[source]#

Import a Fury shader.

Parameters:

shader_file (str) – Filename of shader. The file must be in the fury/shaders directory and must have the one of the supported extensions specified by the Khronos Group (KhronosGroup/glslang).

Returns:

code – GLSL shader code.

Return type:

str

load_shader#

fury.shaders.base.load_shader(shader_file)[source]#

Load a shader from a file.

Parameters:

shader_file (str) – Full path to a shader file ending with one of the file extensions defined by the Khronos Group (KhronosGroup/glslang).

Returns:

code – GLSL shader code.

Return type:

str

load#

fury.shaders.base.load(filename)[source]#

Load a Fury shader file.

Load function has been reimplemented as import_fury_shader.

  • deprecated from version: 0.8.1

  • Raises <class ‘fury.deprecator.ExpiredDeprecationError’> as of version: 0.9.0

Parameters:

filename (str) – Filename of the shader file.

Returns:

code – Shader code.

Return type:

str

shader_to_actor#

fury.shaders.base.shader_to_actor(actor, shader_type, impl_code='', decl_code='', block='valuepass', keep_default=True, replace_first=True, replace_all=False, debug=False)[source]#

Apply your own substitutions to the shader creation process.

A set of string replacements is applied to a shader template. This function let’s apply custom string replacements.

Parameters:
  • actor (vtkActor) – Fury actor you want to set the shader code to.

  • shader_type (str) – Shader type: vertex, fragment

  • impl_code (str, optional) – Shader implementation code, should be a string or filename. Default None.

  • decl_code (str, optional) – Shader declaration code, should be a string or filename. Default None.

  • block (str, optional) – Section name to be replaced. VTK use of heavy string replacements to insert shader and make it flexible. Each section of the shader template have a specific name. For more information: https://vtk.org/Wiki/Shaders_In_VTK. The possible values are: position, normal, light, tcoord, color, clip, camera, prim_id, valuepass. by default valuepass

  • keep_default (bool, optional) – Keep the default block tag to let VTK replace it with its default behavior. Default True.

  • replace_first (bool, optional) – If True, apply this change before the standard VTK replacements. Default True.

  • replace_all (bool, optional) – [description], by default False

  • debug (bool, optional) – Introduce a small error to debug shader code. Default False.

replace_shader_in_actor#

fury.shaders.base.replace_shader_in_actor(actor, shader_type, code)[source]#

Set and replace the shader template with a new one.

Parameters:
  • actor (vtkActor) – Fury actor you want to set the shader code to.

  • shader_type (str) – Shader type: vertex, geometry, fragment.

  • code (str) – New shader template code.

add_shader_callback#

fury.shaders.base.add_shader_callback(actor, callback, priority=0.0)[source]#

Add a shader callback to the actor.

Parameters:
  • actor (vtkActor) – Fury actor you want to add the callback to.

  • callback (callable) – Function or class that contains 3 parameters: caller, event, calldata. This callback will be trigger at each UpdateShaderEvent event.

  • priority (float, optional) – Commands with a higher priority are called first.

Returns:

id_observer – An unsigned Int tag which can be used later to remove the event or retrieve the vtkCommand used in the observer. See more at: https://vtk.org/doc/nightly/html/classvtkObject.html

Return type:

int

Examples

add_shader_callback(actor, func_call1)
id_observer = add_shader_callback(actor, func_call2)
actor.GetMapper().RemoveObserver(id_observer)

Priority calls

test_values = []
def callbackLow(_caller, _event, calldata=None):
    program = calldata
    if program is not None:
        test_values.append(0)

def callbackHigh(_caller, _event, calldata=None):
    program = calldata
    if program is not None:
        test_values.append(999)

def callbackMean(_caller, _event, calldata=None):
    program = calldata
    if program is not None:
        test_values.append(500)

fs.add_shader_callback(
        actor, callbackHigh, 999)
fs.add_shader_callback(
        actor, callbackLow, 0)
id_mean = fs.add_shader_callback(
        actor, callbackMean, 500)

showm.start()
# test_values = [999, 500, 0, 999, 500, 0, ...]

shader_apply_effects#

fury.shaders.base.shader_apply_effects(window, actor, effects, priority=0)[source]#

This applies a specific opengl state (effect) or a list of effects just before the actor’s shader is executed.

Parameters:
  • window (RenderWindow) – For example, this is provided by the ShowManager.window attribute.

  • actor (actor) –

  • effects (a function or a list of functions) –

  • priority (float, optional) – Related with the shader callback command. Effects with a higher priority are applied first and can be override by the others.

Returns:

id_observer – An unsigned Int tag which can be used later to remove the event or retrieve the vtkCommand used in the observer. See more at: https://vtk.org/doc/nightly/html/classvtkObject.html

Return type:

int

attribute_to_actor#

fury.shaders.base.attribute_to_actor(actor, arr, attr_name, deep=True)[source]#

Link a numpy array with vertex attribute.

Parameters:
  • actor (vtkActor) – Fury actor you want to add the vertex attribute to.

  • arr (ndarray) – Array to link to vertices.

  • attr_name (str) – Vertex attribute name. The vtk array will take the same name as the attribute.

  • deep (bool, optional) – If True a deep copy is applied, otherwise a shallow copy is applied. Default True.