PBR materials. Normal map has no effect. bevy 0.9

[kybarg]

When i applying normal map to my meterial I see no effect. Am I doing anything wrong?
Also how can I adjust effect of normal map?

    let cobbelstone_material = materials.add(StandardMaterial {
        reflectance: 0.0,
        metallic: 1.0,
        perceptual_roughness: 0.95,
        base_color_texture: Some(asset_server.load("textures/cobbelstone/Cobblestone01_1K_BaseColor.png")),
        normal_map_texture: Some(asset_server.load("textures/cobbelstone/Cobblestone01_1K_Normal.png")),
        metallic_roughness_texture: Some(asset_server.load("textures/cobbelstone/Cobblestone01_1K_Roughness.png")),
        occlusion_texture: Some(asset_server.load("textures/cobbelstone/Cobblestone01_1K_AO.png")),
        ..default()
    });

[nicopap]

Bevy requires the mesh vertices to have tangents sets to use normal maps, make sure you generate them as described in the StandardMaterial doc (https://docs.rs/bevy/latest/bevy/pbr/struct.StandardMaterial.html#structfield.normal_map_texture)

[nicopap]

I'd suggest you try to modify the normal map in an image editor. I think I managed to reduce the strength of the normal map by "reducing contrast"

[nicopap]

So the steps to reduce the strength of a normal map is:

1. Open the normal map texture in an image editor
2. Create a new layer with uniform color #8080ff
3. adjust the transparency of the original image layer to the percent you think is best
4. Save the new image and use the new image.

[kybarg]

What If I want it to be dynamic? I think there should be a way to adjsut it on shader level, like other engines

[nicopap]

From https://discord.com/channels/691052431525675048/1048329297078800434/1048801698279325776

do other engines have a way to modulate that through a different parameter? Should bevy provide this option

Yeah I think Unity has a material parameter for it.

I don’t have a strong opinion on it, but I think it should be an import setting on the asset rather than a parameter on the shader. That makes for less calculations in the shader, and fewer parameters on the shader.

From my experience it’s uncommon to want to use the same normal map at different intensities.

Bevy wouldn't be able to support that until we have an asset pre-processor. Like Lukas, I also think it isn't useful to change this at runtime, but I agree it should be made a parameter maybe in a future potential editor. The bevy PBR shader already has a lot of parameters, and adding more can reduce performance, so making it an asset preprocessing option seems ideal.

[kybarg]

@nicopap good point, thank you. I've used Unty before and in general have a little experiecne with 3d game development. Sorry for newby quiestions😂