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MaterialX: Implement White Noise node #113495

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Brecht Van Lommel merged 7 commits from DagerD/blender:matx-add-white-noise-node into main 2023-10-23 17:31:51 +02:00
Conversation 1 Commits 7 Files Changed 1 +64
Georgiy Markelov commented 2023-10-10 15:11:36 +02:00
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Purpose

Implement conversion for White Noise node

Technical steps

Implemented conversion for White Noise node

Ref: #112864

### Purpose Implement conversion for White Noise node ### Technical steps Implemented conversion for White Noise node Ref: #112864
Georgiy Markelov added 1 commit 2023-10-10 15:11:48 +02:00
Georgiy Markelov requested review from Brian Savery (AMD) 2023-10-10 15:12:37 +02:00
Georgiy Markelov requested review from Bogdan Nagirniak 2023-10-10 15:12:37 +02:00
Georgiy Markelov requested review from Vasyl Pidhirskyi 2023-10-10 15:12:38 +02:00
Bogdan Nagirniak requested changes 2023-10-11 13:28:31 +02:00
source/blender/nodes/shader/nodes/node_shader_tex_white_noise.cc Outdated
@ -188,0 +191,4 @@
NodeItem noise = empty();
NodeItem vector = get_input_link("Vector", NodeItem::Type::Vector3);
NodeItem w = get_input_value("W", NodeItem::Type::Float);
switch (node_->custom1) {
Bogdan Nagirniak commented 2023-10-11 13:27:42 +02:00
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Add variable which name this node option: int <option name> = node_->custom1.
See example https://projects.blender.org/blender/blender/src/branch/main/source/blender/nodes/shader/nodes/node_shader_math.cc#L186

Add variable which name this node option: `int <option name> = node_->custom1`. See example https://projects.blender.org/blender/blender/src/branch/main/source/blender/nodes/shader/nodes/node_shader_math.cc#L186
DagerD marked this conversation as resolved
source/blender/nodes/shader/nodes/node_shader_tex_white_noise.cc Outdated
@ -188,0 +192,4 @@
NodeItem vector = get_input_link("Vector", NodeItem::Type::Vector3);
NodeItem w = get_input_value("W", NodeItem::Type::Float);
switch (node_->custom1) {
case 1:
Bogdan Nagirniak commented 2023-10-11 13:28:25 +02:00
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Are there existing constants?

Are there existing constants?
DagerD marked this conversation as resolved
Georgiy Markelov added 1 commit 2023-10-11 14:42:16 +02:00
Bogdan Nagirniak requested changes 2023-10-11 15:21:19 +02:00
source/blender/nodes/shader/nodes/node_shader_tex_white_noise.cc Outdated
@ -188,0 +194,4 @@
int dimension = node_->custom1;
switch (dimension) {
case 1:
noise = create_node("cellnoise2d",
Bogdan Nagirniak commented 2023-10-11 15:20:39 +02:00
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Optimize getting values, only w is used here

Optimize getting values, only w is used here
DagerD marked this conversation as resolved
source/blender/nodes/shader/nodes/node_shader_tex_white_noise.cc Outdated
@ -188,0 +218,4 @@
return noise;
}
NodeItem combine = create_node(
Bogdan Nagirniak commented 2023-10-11 15:20:23 +02:00
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Add comment what we are doing here

Add comment what we are doing here
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Georgiy Markelov added 1 commit 2023-10-11 16:00:46 +02:00
b09196dd12 MaterialX: optimize getting values 
Also add comment about colored output
Georgiy Markelov added 1 commit 2023-10-11 16:49:34 +02:00
Brecht Van Lommel commented 2023-10-11 18:53:54 +02:00
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White noise gives a different result for every texture coordinate, it hashes the floating point values. But cell noise I think only changes at different integer coordinates?

The simple trick would be to multiply the texture coordinate by a large number, but that can run into precision issues.

With math nodes something like this could be done, until MaterialX natively supports something like hashnoise in OSL.
https://stackoverflow.com/a/28095165

White noise gives a different result for every texture coordinate, it hashes the floating point values. But cell noise I think only changes at different integer coordinates? The simple trick would be to multiply the texture coordinate by a large number, but that can run into precision issues. With math nodes something like this could be done, until MaterialX natively supports something like `hashnoise` in OSL. https://stackoverflow.com/a/28095165
Bogdan Nagirniak added 1 commit 2023-10-19 18:32:30 +02:00
Bogdan Nagirniak approved these changes 2023-10-19 18:34:04 +02:00
Bogdan Nagirniak left a comment
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Added LARGE_NUMBER texcoord multiplicator.
Tested - works good.

Added `LARGE_NUMBER` texcoord multiplicator. Tested - works good.
Bogdan Nagirniak added 2 commits 2023-10-19 19:22:57 +02:00
Brecht Van Lommel merged commit 132b90651a into main 2023-10-23 17:31:51 +02:00
Brecht Van Lommel deleted branch matx-add-white-noise-node 2023-10-23 17:31:52 +02:00
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Reference: blender/blender#113495
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