Guitarist James Iha and bassist D'arcy Wretzky left the Pumpkins when the band broke up in 2000, and no longer talk to Corgan.
Corgan, who will release the Pumpkins' ninth studio album Oceania early next year, said Siamese Dream was so difficult to make he had started anticipating his own death.
"I was suicidal, and I'd been plotting my own death for about two months, and if you've ever read anything about the warning signs of suicide one of them is you give away all your stuff, and I'd given away all my stuff, I gave away all my records, I started giving away my guitars," he said.
"I was fantasising about my own death, I started thinking what my funeral would be like and what music would be played, I was at that level of insanity."
But he admitted Siamese Dream, which will be re-released next year, was his favourite Pumpkins album.
"Even though it wasn't the one that sold the most, it's the one that seems to have come through the best. As dark a record as Siamese Dream is, there's a lot of fun in it, it's almost like we're kind of laughing at how stupid the whole thing is.
"It's like, here's my pop song about suicide and here's my epic song about child abuse, and here's my big middle finger to the indie world."
Check out the video for Today:
- Herald online