Blender (software): Difference between revisions
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===Geometry Nodes=== | ===Geometry Nodes=== | ||
[https://docs.blender.org/manual/en/latest/modeling/geometry_nodes/index.html Blender Manual Geometry Nodes] | |||
Geometry nodes allow you to procedurally modify the geometry of the object. | Geometry nodes allow you to procedurally modify the geometry of the object. | ||
Some things it can do include instancing of objects, moving vertices, and arithmetic. | Some things it can do include instancing of objects, moving vertices, and arithmetic. | ||
Note that Geometry nodes are available in Blender 2.92+ with some nodes introduced in 2.93 LTS. | |||
See some references: | See some references: | ||
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* [https://www.youtube.com/watch?v=TjGL4RjR13Q Making a raspberry by Bad Normals] | * [https://www.youtube.com/watch?v=TjGL4RjR13Q Making a raspberry by Bad Normals] | ||
* [https://www.youtube.com/watch?v=52UYqe3zdxQ Making a gumdrop by Blender Guru] | * [https://www.youtube.com/watch?v=52UYqe3zdxQ Making a gumdrop by Blender Guru] | ||
==Materials and Shaders== | |||
Blender uses a node system for shader which let you composite different textures and BSDFS. | |||
===Bypass BSDF=== | |||
If you wish to use a raw colors from a texture, bypassing materials altogether, you can directly attach a image texture node output to the material output.<br> | |||
For transparent textures, you will need a transparent BSDF node and a mix node with alpha connected to <code>mix.outputs["Fac"]</code> to achieve transparency. | |||
==Animations== | ==Animations== | ||
==Rendering and Compositing== | ==Rendering and Compositing== | ||
Press | Press {{key press|F12}} to render. | ||
===Denoising=== | ===Denoising=== | ||
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# Add material to an object | # Add material to an object | ||
my_object.data.materials.append(my_material) | my_object.data.materials.append(my_material) | ||
</syntaxhighlight> | |||
====Images==== | |||
<syntaxhighlight lang="python"> | |||
# Add an image | |||
image_bpy = bpy.data.images.new("my_image", width=width, height=height, alpha=(channels==4), float_buffer=False) | |||
image_bpy.pixels = np.flipud(image_np).ravel() | |||
image_tex_node = my_material.node_tree.nodes.new("ShaderNodeTexImage") | |||
image_tex_node.image = image_bpy | |||
my_material.node_tree.links.new(image_tex_node.outputs['Color'], my_bsdf.inputs['Base Color']) | |||
</syntaxhighlight> | </syntaxhighlight> | ||
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exec(compile(open(filepath).read(), filename, 'exec')) | exec(compile(open(filepath).read(), filename, 'exec')) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
===Rendering=== | |||
<syntaxhighlight lang="python"> | |||
def render_to_file(filepath, width, height): | |||
# Set device to GPU | |||
bpy.context.scene.cycles.device = "GPU" | |||
# Set resolution | |||
bpy.context.scene.render.resolution_x = width | |||
bpy.context.scene.render.resolution_y = height | |||
bpy.context.scene.render.resolution_percentage = 100 | |||
# Set output file path | |||
bpy.context.scene.render.filepath = filepath | |||
# Do render | |||
bpy.ops.render.render(write_still=True) | |||
</syntaxhighlight> | |||
===MVP matrices=== | |||
[https://github.com/blender/blender/blob/v2.93.0/doc/python_api/examples/gpu.9.py Example python code] | |||
<syntaxhighlight lang="python"> | |||
# Model matrix | |||
my_object.matrix_world | |||
# View matrix | |||
bpy.context.scene.camera.matrix_world.inverted() | |||
# Projection matrix | |||
projection_matrix = bpy.context.scene.camera.calc_matrix_camera( | |||
bpy.context.evaluated_depsgraph_get(), x=WIDTH, y=HEIGHT) | |||
</syntaxhighlight> | |||
===Python Modules=== | |||
To add modules, install them using pip to the <code>scripts/modules</code> directory of your Blender install: | |||
<pre> | |||
python3.9 -m pip install -t=scripts/modules $MODULE | |||
</pre> | |||
* If you installed blender using snap, you will need to create another scripts directory somewhere else. | |||
==Compiling Blender== | ==Compiling Blender== | ||