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2018-06-28T21:24:04Z

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wiki>LeonardoSegovia: /* Week 1 */ Updating to Sunday's work

2018-05-20T16:50:14Z

‎Week 1: Updating to Sunday's work

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= Week 1 =

Hi everyone! The first week's over, and here's what I've done so far.

== Objectives ==

* Review of Pharr’s code. Implement a dummy Cycles node. Verify exposure of shader’s parameters and test setters/getters.

Since I had Lukas's work available, I managed to extend this week's work to the next two objectives:

* Port Pharr’s shader primitives and statistical tests. Verify they work as expected.
* Port Pharr’s shading function.

== What's been done ==

You may have noticed my commits were on Monday and Friday-Saturday; this was because a short postgraduate course, ''Topics on Logic and Artificial Intelligence in Law'' by [https://www.unibo.it/sitoweb/antonino.rotolo/en Dr. Antonino Rotolo] came up at my uni during this week's Tue-Wed-Thu mornings. (These were an additional 40 hours towards my degree's quota of 540.)

Anyway...

[[File:ZootopiaShaderNode-week-1.png|thumb|center|500px|Preview of the new Principled Hair shader node.]]

* The infrastructure for the shader node is now in place 😄. ({{GitCommit|rB40bc1a5cddf261bdb428a3d07819487b376a6151}})
* Lukas's patch included dummy license info. We (me and Brecht) asked him on IRC, and he stated the code is all his own. The license was updated accordingly ({{GitCommit|rB09bb0bca0f1f77f61bdc832a36458bb311134b1c}})

<blockquote><code>2018-05-18 15:46:02 lukasstockner97_ brecht, regarding your question about the code's origin: I didn't copy-paste anything, the code itself is written from scratch, but the underlying algorithm is an exaxt copy</code>
</blockquote>
<blockquote><code>2018-05-18 15:46:14 lukasstockner97_ So afaik we could license it as Apache 2</code>
</blockquote>
<blockquote><code>2018-05-18 15:46:56 lukasstockner97_ oh, and hi @everyone</code>
</blockquote>
<blockquote><code>2018-05-18 15:48:54 brecht lukasstockner97_: yes, I agree then</code>
</blockquote>
* Reworked some naming conventions to make them follow PBRT and be clearer ({{GitCommit|rB04d40de354eb8a07f840fa168bbb3d375adcf40d}})
* During the weekend, I managed to figure out that (somehow) Cycles creates the shader's closure, but when sampling it, it thinks that it's a Diffuse shader instead! I plugged in a few <code>printf</code>s in <code>bsdf_sample</code>, <code>bsdf_eval</code>, and <code>svm_node_closure_bsdf</code> that reveal the situation. (Ask on IRC if you want the diff)

== Next up ==

Next week I'll revise the implementation, to figure out where and how our shader is morphed into a Diffuse one. As I need more info on Cycles's kernel's code layout to figure this out, I'll ask Brecht and Lukas if they can give me a walkthrough.

== Questions ==

This is mostly for the sake of documentation, I'm planning to publish some time later a sort of "Anatomy of a Shader":

* What is the meaning of RNA and DNA in Cycles? I understand that it integrates the shader's parameters with the UI. I'll be revisiting this in the last weeks.
* What is the registering flow of a shader in Cycles? I should re-read {{GitCommit|rB40bc1a5cddf261bdb428a3d07819487b376a6151}} to better understand it.
* What is the control flow of the sampling process in Cycles? This should give me a clue on where and how our closure is being Diffuse'd.

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利用者:LeonardoSegovia/GSoC 2018/Reports/Week 1 - 版の履歴

Yamyam: 1版 をインポートしました

wiki>LeonardoSegovia: /* Week 1 */ Updating to Sunday's work

Yamyam: 1版をインポートしました