add texture to a node

[hasanshamsijeze]

How can I read a raw model from a file and put it into a NodeGraph and then add a texture, such as color, to it?

[robertosfield]

It's hard to answer this question as it's so open ended with so many different possible interpretations of what you actual want/need.

The only way to provide a specific answer is find out what what the problem you are trying to solve.

1. What type of model are you loading? What format?
2. Does you model have textures already that you want to replace? Replace some or all?
3. If you want to just change colour then is permantant change or are you doing it on the fly such as with highlighting a selected model?
4. What experience do you have with real-time graphics, Vulkan, VSG? We need to know what level to knowledge we can assume with answers.

[hasanshamsijeze]

The model format I load is .vsgb. I cast it to a vsg::Node and render it. The model does not have any textures, and I want to assign different colors to it under different conditions.

For example, imagine a car whose color should change to blue, yellow, red, or green depending on its speed range. Also, when the object is selected, it should turn white, and when it is deselected, it should return to its original color.

I don’t want to use complex textures. Even when I create a node with a builder and assign a color to it, I don’t know how to change its color after it has been created.

One solution that comes to mind is creating a new model with the new color and removing the old one, but I’m worried this approach is not efficient and not a proper or optimal way to do it.

[robertosfield]

How are you getting your data into .vsgb? Is converted from some other 3rd party format?

Could you provide a screen shot of the models you are working with.

You didn't provide any answer for my question 4. How much experienced can we assume you have?

[hasanshamsijeze]

I don’t have direct experience working with Vulkan itself, but for my project I’m using VSG and Rocky. My experience includes camera management, translation matrices, viewport handling, and using prebuilt models with builders, as well as working with Rocky concepts related to meshes and textures.

I’m familiar with concepts such as vertex vectors, normals, texcoords, and indices, although I’m not very confident in calculating them myself. I also know how to work with nodes and I’m familiar with the design pattern used in VSG (the visitor pattern).

I create 3D models using Blender, then convert the generated models to .vsgb format using the vsgconv tool. After that, I load them as nodes using the following code:

auto model = vsg::read_cast<vsg::Node>(filepath);