Bump or height map for OglModel

[BrunoB81HK]

Hi,

My question is simple, is there any way we can apply a normal map on an OglModel so that the visual model will look textured?

I would like to have this :

instead of this :

Thanks a lot for your help!

Bruno

[fredroy]

Hello @BrunoB81HK !

It is possible to have the same effect in SOFA but it is using a kind-of experimental/not really documented things from SOFA, as we realised that we should delegate advanced rendering to the dedicated software (unity, vedo with py3, etc)
But yes, it is possible 🤠, here is an example of a textured liver with diffusion and normal maps among other things:
(this is only the visual node)

<Node name="Visual" >
   <OglShader vertFilename="shaders/shaderLibrary.glsl" fragFilename="shaders/shaderLibrary.glsl"  />
   <OglModel name="organs_liver_gall" filename="m_organs_Liver.obj" putOnlyTexCoords="true"  computeTangents="true" />
   <OglTexture id="DiffuseMap" textureFilename="organs_liver_gall.png" textureUnit="1" />
   <OglTexture id="NormalMap" textureFilename="organs_liver_gall_normalmap.png" textureUnit="2" />
   <OglShaderDefineMacro id="DiffuseMap_Present" />
   <OglShaderDefineMacro id="NormalMap_Present" />
   <OglFloat3Variable id="LightPosition" value="@../../../light/position.value" />
   <OglFloat3Variable id="LightColor" value="@../../../light/color.value" />
   <OglFloat3Variable id="DiffuseColor" value="1 1 1" />
   <OglFloat3Variable id="AmbientColor" value="0.3 0.3 0.3" />
   <OglFloat3Variable id="SpecularColor" value="1 1 1" />
   <OglFloatVariable  name="SpecularRoughness" value="0.05" />
   <OglFloatVariable  name="SpecularReflectance" value="0.28" />
    
   <BarycentricMapping name="visual mapping" input="@../mechanicalDofs" output="@organs_liver_gall" />
</Node>

This is using a shader code present in the share/shaders directory of SOFA.
Keep us in touch with some nice results (if you can 🥴)!

[BrunoB81HK]

I tried to implement this in my code but no texture is rendered. Also, the light is apparently not linking to my scene light. I hardcoded them to have a result.

My code currently consist of the following :

<Node name="Vis">
    <OglShader fileVertexShaders="['shaders/shaderLibrary.glsl']" fileFragmentShaders="['shaders/shaderLibrary.glsl']"  />
    <OglModel name="model" src="@../VisMesh" putOnlyTexCoords="true" computeTangents="true"/>
    <OglTexture id="DiffuseMap" textureFilename="../../../share/textures/LiverTumor.png" textureUnit="1"/>
    <OglTexture id="NormalMap" textureFilename="../../../share/textures/LiverTumorNormalMap.png" textureUnit="2"/>
    <OglShaderDefineMacro id="DiffuseMap_Present"/>
    <OglShaderDefineMacro id="NormalMap_Present"/>
    <OglFloat3Variable id="LightPosition" value="1 0 0" />
    <OglFloat3Variable id="LightColor" value="1 1 1" />
    <OglFloat3Variable id="DiffuseColor" value="1 1 1" />
    <OglFloat3Variable id="AmbientColor" value="0.3 0.3 0.3" />
    <OglFloat3Variable id="SpecularColor" value="1 1 1" />
    <OglFloatVariable  name="Roughness" value="0.15" />
    <OglFloatVariable  name="Specular" value="0.244" />

    <BarycentricMapping input="@../DOFs" output="@model"/>

</Node>

and I have some weird bugs like this :

[fredroy]

Yeah, does not look like bump mapping to me 🙃
Is there any warning from the shader compiler ?
Seems like some attributes (texcoord?) are not well linked...
Can you share the mesh and the texture files? I will try to make it work.

[BrunoB81HK]

Hi @fredroy, thanks a lot for your help! 🙂

There was no warning when I ran it in SOFA. I must say that I use runSofaGLFW instead of runSofa. I tested with runSofa and I get the same results.

Are the warnings from the shader compilers written when I compile everything with CMake or do I need to compile something else? If I don't, I don't think I saw any warning related to the shaders.

I will send you the needed files on Gitter.

[fredroy]

Hello @BrunoB81HK
Actually, there was a problem in the OpenGL code #2855
After fixing the types, the normal mapping is working.

Seems a bit too much to me 🧐 some tweaks would be needed I guess

[BrunoB81HK]

TThis indeed looks too much. I will tweak it to my liking. 😄

Thanks a lot for your help and have a nice day!

[fredroy]

👍