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<a class="skip" href="#main">Skip to content</a>
<div class="topbar">
<a class="back" href="../"><span aria-hidden="true">←</span> Examples Gallery</a>
<div class="topbar-right">
<a class="ghlink" href="https://github.com/TMHSDigital/Blender-Developer-Tools">GitHub</a>
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</div>
<header class="hero">
<h1>driver-wave</h1>
<p>A driver_namespace function driving sixteen column heights through SCRIPTED drivers — the sine skyline is entirely driver-evaluated.</p>
</header>
<main id="main">
<button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom driver-wave render">
<img src="../assets/driver-wave-hero.webp" alt="driver-wave render" width="1280" height="720" />
</button>
<p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
<div class="callout"><span class="tag">witnesses</span> Driven values appear after a view-layer update in two places that must agree: the evaluated copy and the original datablock the animation system flushes for display.</div>
<div class="runline">
<pre id="runCmd">blender --background --python examples/driver-wave/driver_wave.py --</pre>
<button class="copy-btn" id="copyRun" type="button">Copy</button>
</div>
<section class="detail-section md">
<p>A runnable example that drives sixteen column heights from a custom function registered in <code>bpy.app.driver_namespace</code> — the pattern from <a href="https://github.com/TMHSDigital/Blender-Developer-Tools/tree/main/skills/drivers-and-app-handlers/SKILL.md"><code>drivers-and-app-handlers</code></a>. Each column gets a SCRIPTED driver on Z scale whose expression calls <code>wave_scale(i)</code>, producing a sine skyline.</p>
<p><strong>What it witnesses:</strong> the driver evaluation contract. Driven values appear only after a view-layer update, and they land in <strong>two</strong> places that must agree: the depsgraph-evaluated copy (<code>evaluated_get(dg).scale</code>) and the original datablock, which the animation system flushes for display. The check asserts both against the closed-form profile.</p>
<p>Note for real add-ons: <code>driver_namespace</code> entries do <strong>not</strong> persist in <code>.blend</code> files — re-register them from a <code>load_post</code> handler, or every driver that calls them fails on file open. Headless, registering before driver creation (as here) is enough.</p>
<h2>Run</h2>
<pre><code># Cheap correctness check (no render) — the CI check:
blender --background --python driver_wave.py --
# Also render a still (EEVEE on a GPU host; use --engine cycles on GPU-less hosts):
blender --background --python driver_wave.py -- --output driver.png
blender --background --python driver_wave.py -- --output driver.png --engine cycles</code></pre>
<p>It exits non-zero on failure (driven value wrong, or the flush-back disagreed). The <code>blender-smoke</code> workflow runs the check on Blender 4.5 LTS and 5.1.</p>
</section>
<section class="detail-section src">
<h2>Source</h2>
<div class="src-meta">
<code>examples/driver-wave/driver_wave.py</code>
<a href="https://github.com/TMHSDigital/Blender-Developer-Tools/tree/main/examples/driver-wave/driver_wave.py">View on GitHub →</a>
</div>
<pre><span class="s">"""Driver-namespace scale drivers, evaluated through the depsgraph — a runnable example.
Witnesses the drivers-and-app-handlers contract end to end: a custom function
is registered in `bpy.app.driver_namespace`, sixteen columns get a SCRIPTED
driver on Z scale calling it, and the check reads the driven values back
after a view-layer update — from the evaluated copy AND from the original
(the animation system flushes driven values back to the original datablock
for display, so both must agree). Asserts both against the closed-form
profile. Exits non-zero on failure.
By default it runs only the correctness check (no render) — the CI smoke
check. Pass --output to also render a still:
blender --background --python driver_wave.py -- # check only
blender --background --python driver_wave.py -- --output d.png # + render
"""</span>
<span class="k">import</span> bpy, bmesh, sys, os, math, argparse
COUNT = <span class="n">16</span>
SPACING = <span class="n">0.72</span>
BASE = <span class="n">0.28</span>
<span class="k">def</span> wave_scale(i):
<span class="s">"""The driver function: column height profile, 0.4..2.4."""</span>
<span class="k">return</span> <span class="n">1.4</span> + math.sin(i * <span class="n">0.6</span>) <span class="k">if</span> i >= <span class="n">0</span> <span class="k">else</span> <span class="n">1.0</span>
<span class="k">def</span> build_columns():
bpy.ops.wm.read_factory_settings(use_empty=<span class="k">True</span>)
<span class="c"># driver_namespace entries do not persist in .blend files; real add-ons</span>
<span class="c"># re-register them from a load_post handler. Headless, registering before</span>
<span class="c"># driver creation is enough.</span>
bpy.app.driver_namespace[<span class="s">"wave_scale"</span>] = wave_scale
me = bpy.data.meshes.new(<span class="s">"Column"</span>)
bm = bmesh.new()
<span class="k">try</span>:
bmesh.ops.create_cube(bm, size=<span class="n">1.0</span>)
bm.to_mesh(me)
<span class="k">finally</span>:
bm.free()
objs = []
x0 = -(COUNT - <span class="n">1</span>) * SPACING / <span class="n">2</span>
<span class="k">for</span> i <span class="k">in</span> range(COUNT):
obj = bpy.data.objects.new(<span class="s">f"</span><span class="s">Col.</span>{i:<span class="s">02d</span>}<span class="s">"</span>, me)
obj.location = (x0 + i * SPACING, <span class="n">0.0</span>, <span class="n">0.0</span>)
obj.scale = (BASE, BASE, <span class="n">1.0</span>)
fcu = obj.driver_add(<span class="s">"scale"</span>, <span class="n">2</span>)
fcu.driver.type = <span class="s">'SCRIPTED'</span>
fcu.driver.expression = <span class="s">f"</span><span class="s">wave_scale(</span>{i}<span class="s">)</span><span class="s">"</span>
bpy.context.collection.objects.link(obj)
objs.append(obj)
<span class="k">return</span> objs
<span class="k">def</span> check(objs):
bpy.context.view_layer.update()
dg = bpy.context.evaluated_depsgraph_get()
<span class="k">for</span> i, obj <span class="k">in</span> enumerate(objs):
expect = wave_scale(i)
driven = obj.evaluated_get(dg).scale[<span class="n">2</span>]
<span class="k">if</span> abs(driven - expect) > <span class="n">1e-4</span>:
print(<span class="s">f"</span><span class="s">ERROR: col </span>{i}<span class="s"> evaluated scale </span>{driven:<span class="s">.4f</span>}<span class="s"> != wave_scale </span>{expect:<span class="s">.4f</span>}<span class="s">"</span>,
file=sys.stderr)
<span class="k">return</span> <span class="n">3</span>
<span class="c"># drivers flush back to the original datablock for display — both agree</span>
<span class="k">if</span> abs(obj.scale[<span class="n">2</span>] - expect) > <span class="n">1e-4</span>:
print(<span class="s">f"</span><span class="s">ERROR: col </span>{i}<span class="s"> original scale </span>{obj.scale[<span class="n">2</span>]:<span class="s">.4f</span>}<span class="s"> not flushed </span><span class="s">"</span>
<span class="s">f"</span><span class="s">(expected </span>{expect:<span class="s">.4f</span>}<span class="s">)</span><span class="s">"</span>, file=sys.stderr)
<span class="k">return</span> <span class="n">4</span>
lo = min(wave_scale(i) <span class="k">for</span> i <span class="k">in</span> range(COUNT))
hi = max(wave_scale(i) <span class="k">for</span> i <span class="k">in</span> range(COUNT))
print(<span class="s">f"</span><span class="s">columns=</span>{COUNT}<span class="s"> driven_range=</span>{lo:<span class="s">.3f</span>}<span class="s">..</span>{hi:<span class="s">.3f</span>}<span class="s"> flushed_to_original=True</span><span class="s">"</span>)
<span class="k">return</span> <span class="n">0</span>
<span class="k">def</span> eevee_engine_id():
<span class="k">return</span> <span class="s">'BLENDER_EEVEE'</span> <span class="k">if</span> bpy.app.version >= (<span class="n">5</span>, <span class="n">0</span>, <span class="n">0</span>) <span class="k">else</span> <span class="s">'BLENDER_EEVEE_NEXT'</span>
<span class="k">def</span> render_still(objs, path, engine):
scene = bpy.context.scene
mat = bpy.data.materials.new(<span class="s">"ColMat"</span>)
mat.use_nodes = <span class="k">True</span>
bsdf = mat.node_tree.nodes[<span class="s">"Principled BSDF"</span>]
bsdf.inputs[<span class="s">"Base Color"</span>].default_value = (<span class="n">1.0</span>, <span class="n">0.26</span>, <span class="n">0.012</span>, <span class="n">1.0</span>) <span class="c"># selection orange</span>
bsdf.inputs[<span class="s">"Roughness"</span>].default_value = <span class="n">0.32</span>
objs[<span class="n">0</span>].data.materials.append(mat) <span class="c"># shared mesh -> all columns</span>
<span class="c"># columns stand on the floor: lift each by its DRIVEN half-height</span>
dg = bpy.context.evaluated_depsgraph_get()
<span class="k">for</span> obj <span class="k">in</span> objs:
obj.location.z = obj.evaluated_get(dg).scale[<span class="n">2</span>] / <span class="n">2</span>
floor_me = bpy.data.meshes.new(<span class="s">"Floor"</span>)
bm = bmesh.new()
<span class="k">try</span>:
bmesh.ops.create_grid(bm, x_segments=<span class="n">1</span>, y_segments=<span class="n">1</span>, size=<span class="n">30.0</span>)
bm.to_mesh(floor_me)
<span class="k">finally</span>:
bm.free()
floor = bpy.data.objects.new(<span class="s">"Floor"</span>, floor_me)
fmat = bpy.data.materials.new(<span class="s">"FloorMat"</span>)
fmat.use_nodes = <span class="k">True</span>
fb = fmat.node_tree.nodes[<span class="s">"Principled BSDF"</span>]
fb.inputs[<span class="s">"Base Color"</span>].default_value = (<span class="n">0.055</span>, <span class="n">0.06</span>, <span class="n">0.07</span>, <span class="n">1.0</span>) <span class="c"># dark graphite studio</span>
fb.inputs[<span class="s">"Roughness"</span>].default_value = <span class="n">0.5</span>
floor_me.materials.append(fmat)
scene.collection.objects.link(floor)
wall = bpy.data.objects.new(<span class="s">"Wall"</span>, floor_me.copy())
wall.location = (<span class="n">0.0</span>, <span class="n">9.0</span>, <span class="n">0.0</span>)
wall.rotation_euler = (math.radians(<span class="n">90</span>), <span class="n">0.0</span>, <span class="n">0.0</span>)
scene.collection.objects.link(wall)
world = bpy.data.worlds.new(<span class="s">"World"</span>)
world.use_nodes = <span class="k">True</span>
world.node_tree.nodes[<span class="s">"Background"</span>].inputs[<span class="s">"Color"</span>].default_value = (<span class="n">0.008</span>, <span class="n">0.009</span>, <span class="n">0.012</span>, <span class="n">1.0</span>)
scene.world = world
key = bpy.data.lights.new(<span class="s">"Key"</span>, <span class="s">'AREA'</span>); key.energy = <span class="n">1600.0</span>; key.size = <span class="n">5.0</span>
key.color = (<span class="n">1.0</span>, <span class="n">0.97</span>, <span class="n">0.92</span>)
key_ob = bpy.data.objects.new(<span class="s">"Key"</span>, key)
key_ob.location = (-<span class="n">4.5</span>, -<span class="n">5.5</span>, <span class="n">6.5</span>)
key_ob.rotation_euler = (math.radians(<span class="n">46</span>), <span class="n">0.0</span>, math.radians(-<span class="n">33</span>))
scene.collection.objects.link(key_ob)
fill = bpy.data.lights.new(<span class="s">"Fill"</span>, <span class="s">'AREA'</span>); fill.energy = <span class="n">260.0</span>; fill.size = <span class="n">8.0</span>
fill.color = (<span class="n">0.8</span>, <span class="n">0.87</span>, <span class="n">1.0</span>)
fill_ob = bpy.data.objects.new(<span class="s">"Fill"</span>, fill)
fill_ob.location = (<span class="n">5.5</span>, -<span class="n">4.0</span>, <span class="n">3.5</span>)
fill_ob.rotation_euler = (math.radians(<span class="n">62</span>), <span class="n">0.0</span>, math.radians(<span class="n">48</span>))
scene.collection.objects.link(fill_ob)
rim = bpy.data.lights.new(<span class="s">"Rim"</span>, <span class="s">'AREA'</span>); rim.energy = <span class="n">480.0</span>; rim.size = <span class="n">5.0</span>
rim.color = (<span class="n">0.75</span>, <span class="n">0.85</span>, <span class="n">1.0</span>)
rim_ob = bpy.data.objects.new(<span class="s">"Rim"</span>, rim)
rim_ob.location = (<span class="n">0.0</span>, <span class="n">6.5</span>, <span class="n">3.0</span>)
rim_ob.rotation_euler = (math.radians(-<span class="n">78</span>), <span class="n">0.0</span>, math.radians(<span class="n">180</span>))
scene.collection.objects.link(rim_ob)
cam_data = bpy.data.cameras.new(<span class="s">"Cam"</span>); cam_data.lens = <span class="n">45.0</span>
cam = bpy.data.objects.new(<span class="s">"Cam"</span>, cam_data)
cam.location = (<span class="n">0.0</span>, -<span class="n">13.0</span>, <span class="n">2.4</span>)
cam.rotation_euler = (math.radians(<span class="n">83</span>), <span class="n">0.0</span>, <span class="n">0.0</span>)
scene.collection.objects.link(cam)
scene.camera = cam
scene.render.engine = <span class="s">'CYCLES'</span> <span class="k">if</span> engine == <span class="s">'cycles'</span> <span class="k">else</span> eevee_engine_id()
<span class="k">if</span> engine == <span class="s">'cycles'</span>:
scene.cycles.samples = <span class="n">32</span>
scene.render.resolution_x = <span class="n">1280</span>
scene.render.resolution_y = <span class="n">720</span>
scene.render.image_settings.file_format = <span class="s">'PNG'</span>
scene.render.filepath = path
bpy.ops.render.render(write_still=<span class="k">True</span>)
<span class="k">return</span> os.path.exists(path) <span class="k">and</span> os.path.getsize(path) > <span class="n">0</span>
<span class="k">def</span> main():
argv = sys.argv[sys.argv.index(<span class="s">"--"</span>) + <span class="n">1</span>:] <span class="k">if</span> <span class="s">"--"</span> <span class="k">in</span> sys.argv <span class="k">else</span> []
p = argparse.ArgumentParser()
p.add_argument(<span class="s">"--output"</span>, default=<span class="k">None</span>, help=<span class="s">"optional: render a still PNG here"</span>)
p.add_argument(<span class="s">"--engine"</span>, default=<span class="s">"eevee"</span>, choices=(<span class="s">"eevee"</span>, <span class="s">"cycles"</span>),
help=<span class="s">"render engine for --output (cycles for GPU-less hosts)"</span>)
args = p.parse_args(argv)
objs = build_columns()
code = check(objs)
<span class="k">if</span> code:
<span class="k">return</span> code
<span class="k">if</span> args.output:
<span class="k">if</span> <span class="k">not</span> render_still(objs, os.path.abspath(args.output), args.engine):
print(<span class="s">"ERROR: render produced no file"</span>, file=sys.stderr)
<span class="k">return</span> <span class="n">6</span>
print(<span class="s">f"</span><span class="s">rendered still </span>{args.output}<span class="s">"</span>)
print(<span class="s">"driver-wave OK"</span>)
<span class="k">return</span> <span class="n">0</span>
<span class="k">if</span> __name__ == <span class="s">"__main__"</span>:
<span class="k">try</span>:
sys.exit(main())
<span class="k">except</span> Exception <span class="k">as</span> e:
<span class="k">import</span> traceback; traceback.print_exc(); print(<span class="s">f"</span><span class="s">FATAL: </span>{e}<span class="s">"</span>, file=sys.stderr); sys.exit(<span class="n">1</span>)
</pre>
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