https://www.mixmods.com.br/2020/04/chroma-key.html

Chroma Key.sc

// by Junior_Djjr
// You need: https://forum.mixmods.com.br/f16-utilidades/t179-gta3script-while-true-return_true-e-return_false
SCRIPT_START
{
    LVAR_INT scplayer iModel hObj bCreated
    LVAR_FLOAT fScale x y z

    GET_PLAYER_CHAR 0 scplayer

    IF NOT READ_INT_FROM_INI_FILE "CLEO/Chroma Key.ini" "Settings" "ModelId" (iModel)
        iModel = 7977
    ENDIF

    IF NOT READ_FLOAT_FROM_INI_FILE "CLEO/Chroma Key.ini" "Settings" "Scale" (fScale)
        fScale = 1.0
    ENDIF
 
    WHILE TRUE
        WAIT 0

        IF TEST_CHEAT "CHROMAKEY"
            IF bCreated = FALSE
                GET_CHAR_COORDINATES scplayer x y z
                z -= 6.5
                REQUEST_MODEL iModel
                LOAD_ALL_MODELS_NOW
                CREATE_OBJECT iModel x y z (hObj)
                MARK_MODEL_AS_NO_LONGER_NEEDED iModel
                SET_OBJECT_SCALE hObj fScale
                bCreated = TRUE
            ELSE
                DELETE_OBJECT hObj
                bCreated = FALSE
            ENDIF
        ENDIF

    ENDWHILE

}
SCRIPT_END