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you can try

SceCtrlData pad;
sceCtrlReadBufferPositive(&pad, 1);
if (pad.Buttons & PSP_CTRL_HOME) ...

this way you know if the home button was pushed

but where did you find that function ? (sceImposeGetHomePopup) what sdk are you using ?!

very nice library, but there are a few functions missing, like: rotate_matrixX(M44, angle) rotate_matrixY(M44, angle) rotate_matrixZ(M44, angle) rotate_matrixXYZ(M44, anglex, angley, anglez) multiply_matrix(M44, M44, M44) vector_cross_multiply (for FVector3 and FVector4) could you help me with this ...