Texture Vector input problems when using RGB values as input #49640

New Issue

Tobiasz Karoń · 2016-10-12T13:39:59+02:00

Tobiasz Karoń commented

2016-10-12 13:39:59 +02:00

I use RGB data to locate pixels in my image texture.

I used an Combine XYZ node to convert Color values to Vector type to drive the Image Texture node's Vector input.

Now I need to use a Vector Transform node in the middle for the coordinates to have any effect on the texture mapping.

If I plug a straight RGB color output to the Vector input - the Image Texxture ignores it and uses mesh's UV mapping instead.
If I use Combine XYZ node to feed the Image Texture's Vector input - it's ignored also and default UV is used instead.

Gradient Texture node behaves differently though:

If RGB or Combine XYZ nodes are used to feed it - it returns black. Only works as expected if a Vector Transform node is in-between.

Looks like Combine XYZ node's Vector output is not good enough for Texture nodes for some reason, but pushing it through a Vector Transform (that does no change) makes the data acceptable and the textures are mapped as expected.

Here's a test project: Texture vector input bug test 01.blend

Screenshot:

Roll around the RGB node's color circle - the color of the cube should change.
Connect either the raw RGB, Combine XYZ or Vector transfor output to the Vector reroute.
Disconnect the Vector Reroute to see UV-mapped texture on the cube (Image Texture and Gradient mixed).

All three sources should give the same output - because the numbers fed into the Vector reroute are essentially the same. Aren't they? So why only Vector Transform node output makes the color circle change the mapping of the texture on the Cube?

In Blender 2.78 only Vector Transform works as expected.
In Blender 2.77a Vector Transform and Combine XYZ give the same result.

I'd expect pure RGB plugged into Vector to also work here the same way - why one would not want this? Am I missing something?

I use RGB data to locate pixels in my image texture. I used an Combine XYZ node to convert Color values to Vector type to drive the Image Texture node's Vector input. Now I need to use a Vector Transform node in the middle for the coordinates to have any effect on the texture mapping. If I plug a straight RGB color output to the Vector input - the Image Texxture ignores it and uses mesh's UV mapping instead. If I use Combine XYZ node to feed the Image Texture's Vector input - it's ignored also and default UV is used instead. Gradient Texture node behaves differently though: If RGB or Combine XYZ nodes are used to feed it - it returns black. Only works as expected if a Vector Transform node is in-between. Looks like Combine XYZ node's Vector output is not good enough for Texture nodes for some reason, but pushing it through a Vector Transform (that does no change) makes the data acceptable and the textures are mapped as expected. **Here's a test project:** [Texture vector input bug test 01.blend](https://archive.blender.org/developer/F377313/Texture_vector_input_bug_test_01.blend) Screenshot: ![Selection_012.png](https://archive.blender.org/developer/F377314/Selection_012.png) Roll around the RGB node's color circle - the color of the cube should change. Connect either the raw RGB, Combine XYZ or Vector transfor output to the Vector reroute. Disconnect the Vector Reroute to see UV-mapped texture on the cube (Image Texture and Gradient mixed). All three sources should give the same output - because the numbers fed into the Vector reroute are essentially the same. Aren't they? So why only Vector Transform node output makes the color circle change the mapping of the texture on the Cube? In Blender 2.78 only Vector Transform works as expected. In Blender 2.77a Vector Transform and Combine XYZ give the same result. I'd expect pure RGB plugged into Vector to also work here the same way - why one would not want this? Am I missing something?

Tobiasz Karoń commented

2016-10-12 13:39:59 +02:00

Changed status to: 'Open'

Tobiasz Karoń commented

2016-10-12 13:39:59 +02:00

Added subscriber: @TobiaszunfaKaron

blender-admin commented

2016-10-12 18:36:41 +02:00

This issue was referenced by blender/cycles@286fd770a3

This issue was referenced by blender/cycles@286fd770a3fbeae63043d7aa26bbe32739475e6a

blender-admin commented

2016-10-12 18:36:41 +02:00

This issue was referenced by 7f5441b916

This issue was referenced by 7f5441b9167e46761c944584719a556d4604da46

Brecht Van Lommel commented

2016-10-12 18:51:26 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2016-10-12 18:51:26 +02:00

Sign in to join this conversation.

3 Participants

Notifications

Due Date

No due date set.

Dependencies

No dependencies set.

Reference: blender/blender#49640

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Texture Vector input problems when using RGB values as input #49640