Actually there is no rule to prevent it. As long as you have movement left you can use it.There is no reason why someone could not walk up to a wall and then start climbing.
Now if we were talking about different amount of speeds, say 30ft walk and 20ft climb?
I'd probably scale everything to the nearest 5ft increment. So if there's a 50-50 split between walking and climbing, I'd go with 15ft walk with 10ft climb leftover.
Actually there is no rule to prevent it. As long as you have movement left you can use it.There is no reason why someone could not walk up to a wall and then start climbing.Pathfinder is a permissive rules system. There is also no rule saying that I can't kill every enemy by just pointing my finger at them, but because no rule explicitly allows me to do so I can't.
CrankyDog:
That's a very reasonable house rule, but is there anything in the actual rule set (or FAQ or Errata, or even a Dev comment) that says this is possible or how it would work?
There is also no rule saying everything you can do. If you use your movement to walk up to a wall there is no reason you could no begin climbing no matter if you had a climb speed or not.
Imagine you are flying and you land on the ground, is there a reason your legs are not going to allow you to walk?
I will put it another way. The rules say that if you have movement left that you can move. They don't say you can only continue moving via the same way you started. Since movement covers all modes of movement there would need to be a rule restricting movement types to go against that general rule.
There are some things in the game for which there are no rules, such as how do you determine how much movement is left when the two modes of movement have different speeds. Most GM's prorate it like Cranky did. Another example of rules not being detailed is mirror image. The spell does not tell you how to determine which image is missed. Some use the D100 dice. I add the caster to the number of images, and use that for the nice needed. If it is an odd number then I use dice that are one higher and ignore the highest number.
Yeah sometimes the books tells you some things you can do, and then the GM has to figure out the rest<---That is what I am getting at.
That is because the book can't cover every scenario, so the GM is expected to figure some of this out or make his own decision.
So there is no rule you're aware of that allows it, but you and Cranky Dog would house rule it the same way. Thanks for your input.
Does anyone else know of anything in the written rules about mixing movement modes in a single action?
Actually I just told you the game says you are allowed your movement, and both are forms of movement. It is actually a houserule to not allow it. How to apply it when the movement speeds don't match is up to the GM.
You are just looking for an explicit statement that says "you can use form A and form B" as opposed to "you can can do x(which includes forms A and B".
However that is like asking for a rule on whether or not a dagger can cut a rope when we know daggers do damage and ropes can be damaged. Do I really need to call out daggers and ropes?
Here is an official rule. It is under the climb skill.
Action: Climbing is part of movement, so it's generally part of a move action (and may be combined with other types of movement in a move action). Each move action that includes any climbing requires a separate Climb check. Catching yourself or another falling character doesn't take an action.
Yes, Climbing, Swimming, Jumping, and Tumbling are all defined as a usage of movement speed (4x, 4x, 1x, and 1x respectively, without accelerated versions). So it's clear you *can* combine them. Pretty straight forward to use different ratios based on speed.