Multiple Materials

[SpiderPig]

Through brief trial and error I got this example to work.  I want to be able to get the materials index so I can retrieve multiple materials in the shader for my voxel terrain.  I can find a way to send the materials indexes I need to the shader, that shouldn't be a problem.  (I'll probably use a small texture to hold the index)  It's just actually getting the material index.  Something like this perhaps?

material->GetIndex()

My C++ Code:

auto material1 = CreateMaterial();
material1->SetColor(0, 1, 0);
auto material2 = CreateMaterial();
material2->SetColor(1, 0, 0);

...
  
terrain->SetMaterial("VoxelObject.mat");

My Shader Code:

Material m1 = materials[3];
Material m2 = materials[4];

float slope = getSlope(normal);
color = mix(m1.diffuseColor, m2.diffuseColor, slope);

The Result:

[Josh]

I have thought of the idea of using the terrain material painting system to apply multiple materials to a mesh. As long as they all use the same shader family it will work. Stay tuned on this...

[SpiderPig]

Yeah that'd be great.

[SpiderPig]

I wonder if it's too much to ask for a temporary solution for this?  Just the ability to get the index the material is stored in the shader is enough, I can do the rest and send it to my shader.  I'd like to get a nice material up and running for the voxel terrain.  I'm just guessing at what the material index is in the shader.  It changes though as the game grows though. 

[SpiderPig]

On 2/25/2023 at 6:26 PM, SpiderPig said:

Through brief trial and error I got this example to work.  I want to be able to get the materials index so I can retrieve multiple materials in the shader for my voxel terrain.  I can find a way to send the materials indexes I need to the shader, that shouldn't be a problem.  (I'll probably use a small texture to hold the index)  It's just actually getting the material index.  Something like this perhaps?

material->GetIndex()

My C++ Code:

Is this possible yet?

 

[SpiderPig]

I may not be correct but it might be this I need -

material->render_material->id;

 

[Josh]

Okay, I am adding a new method Material::GetHandle, which will return the index of the material in the material array.

This method must ONLY be called from a render hook. See World::AddHook.

[SpiderPig]

On 1/10/2024 at 3:06 AM, Josh said:

This method must ONLY be called from a render hook. See World::AddHook.

I can't find this in the documentation.  

[Josh]

And you won't. This is a special thing I added for @klepto2

The Hook ID can be HOOK_TRANSFER or HOOK_RENDER.

[SpiderPig]

Works perfectly thankyou!