about lighting used to make dataset

[yl949]

@guanyingc Hello, thanks you for sharing the synthetic data.
I have some questions about the dataset:

1. what type emitter did you use to generate the data? Is the point light far from the object to mimic the effect of parallel light?
2. what sensor do you used to mimic the orthogonal camera? In the document of Mitsuba2, I don't find the orthographic type sensor.
3. Mitsuba2 use xml file to create the scene. How do you use python to dynamically edit scene and render all result?
   Thanks again!

[guanyingc]

Hi, please kindly refer to #15
The follow is the xml we used in Mitsuba.

<integrator type="multichannel">
    <integrator type="field">
        <string name ="field" value="shNormal" />
        <spectrum name="undefined" value="0" />
        <!--Occlusion-->
    </integrator>
</integrator>

<shape type="sphere" id="obj1">
    <point name="center" x="$tx" y="$ty" z="$tz" />
    <float name="radius" value="$scale" />
</shape>

<sensor type="orthographic">
    <float name="farClip" value="55.864"/>
	<float name="nearClip" value="0.10864"/>
	<transform name="toWorld">
        <lookat target="0, 0, -14" origin="0, 0, -15" up="0, 1, 0"/>
	</transform>

	<sampler type="ldsampler">
		<integer name="sampleCount" value="64"/>
	</sampler>

	<film type="hdrfilm">
		<integer name="height" value="$h"/>
		<integer name="width" value="$w"/>

        <string  name="pixelFormat"  value="rgb"/>
        <string  name="channelNames" value="normal"/>
		<rfilter type="gaussian"/>
        <boolean name="banner" value="false"/>
	</film>
</sensor>

[yl949]

Thank you for you reply. I have read the #15 before ask the question above.
Could you give me the version of mitsuba you used? I use <scene version='2.0.0'>, but there is no orthogonal cammera.
What's more, there is no emitter in your xml. So how do you know the intensity (irradiance) and direction of the light?

[guanyingc]

Oh, sorry. It seems that the Github markdown cannot display the whole xml file. Please kindly see example xml in this link.

We use scene version 0.5.0.

render_single_obj_img.txt

[yl949]

Thanks a lot!