If I write this shader:

[source lang="cpp"]uniform samplerCube cubeTest;uniform samplerCube terrainNoiseTexture;void main(void){     fragmentColour.rbg = texture(terrainNoiseTexture, vec3(rawNormal.xyz)).rrr; fragmentColour.rbg += texture(cubeTest, vec3(rawNormal.xyz)).rrr; fragmentColour.a = 1;}[/source]

I can suddenly read  from the black cubemap as expected....

Maybe I just should update my drivers...
Still nothing. So what could cause a cubemap to be all blick until I sample another cubemap first?

If I write this shader:

[source lang="cpp"]uniform samplerCube cubeTest;uniform samplerCube terrainNoiseTexture;void main(void){     fragmentColour.rbg = texture(terrainNoiseTexture, vec3(rawNormal.xyz)).rrr; fragmentColour.rbg += texture(cubeTest, vec3(rawNormal.xyz)).rrr; fragmentColour.a = 1;}[/source]

I can suddenly read  from the black cubemap as expected....

Maybe I just should update my drivers...
Still nothing. So what could cause a cubemap to be all blick until I sample another cubemap first?

If I write this shader:

[source lang="cpp"]uniform samplerCube cubeTest;uniform samplerCube terrainNoiseTexture;void main(void){     fragmentColour.rbg = texture(terrainNoiseTexture, vec3(rawNormal.xyz)).rrr; fragmentColour.rbg += texture(cubeTest, vec3(rawNormal.xyz)).rrr; fragmentColour.a = 1;}[/source]

I can suddenly read  from the black cubemap as expected....

Maybe I just should update my drivers...