Is there an easy way to use motion blur like speed lines to indicate movement in a Poser still image?

  • @wimvdb Hey Wim, what dress is that?

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    @eclark1849 said in Is there an easy way to use motion blur like speed lines to indicate movement in a Poser still image?:

    @wimvdb Hey Wim, what dress is that?

    Drawstring shirt (dynamic) from whimsysmile/frequency at Rendo

  • The google image posted has been post worked. It is not generating 'speed lines' because if it was, the lights would also be leaving trails. Further, you can see the point at which the image has been extended where the kerb line curves behind the rear wheels. True motion blur would not look like that.
    To have the subject stay sharp and the background blur in Poser you need to understand that motion blur blurs what is moving in the scene. Unfortunately it is NOT what is moving in the frame.
    For example, if you parent a camera to a car and move the car a distance in the last frame so that the car remains frozen in frame but the background moves, the render will still blur the car (because it was the car that moved).
    To keep the car sharp, you have to leave the car in the same XYZ space for the full animation and MOVE THE BACKGROUND.
    Fortunately I have street scene where I've grouped the houses, road trees... I put a car down on the street, set the camera to a suitably dramatic perspective, then at frame 30 I moved the STREET 15m on the X axis (the direction the car was facing) and rendered. Don't forget to spin the wheels on the car!
    BTW, 15m is roughly the distance a car travelling at the speed limit will cover in the 1 second the 30 frames represent.
    Image below.
    alt text

    If you want the 'light trails' out the back, I think the only way is to spawn a prop of the lights move them with the street at frame 30.

  • @willshetterly said in Is there an easy way to use motion blur like speed lines to indicate movement in a Poser still image?:

    A quick google brought up this image, which is more like what I'm hoping for:alt text

    To me the motion blur on that image is not the car, but the background - the colours of the lines to the left of the car don't match the car at all, do they ? To get something similar in Poser I'd guess you'd parent a dolly camera to the car and move the car. Or have a fixed car and camera and move the background.

    (edit: just seen that somebody already said that! :) )

  • Just wanted to say I'm really appreciating the suggestions here. I hope to be experimenting with them soon.

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    There is a photographic technique called 'second curtain sync' where a long exposure is combined with a flash that fires just before the shutter closes. This can give the effect of a motion trail leading to a sharp moving subject. I have no idea if it's possible to replicate the technique in 3d, but thought it may be of interest.

  • @caisson This example of second curtain flash is very close to what I'd love Poser to do natively:alt text

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    I don't know of any way to do it inside Poser; combining renders in an image editor is all I can think of unfortunately ...

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    Put two copies of the prop in the scene, one stationary (but with wheels spinning) and the other moving into alignment with the stationary one.

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    I just tried it (really low render settings)

    Seems workable. There's a shadow problem, though. Not sure if Poser motion blurs shadows.

    0_1467223337848_blur snap.jpg

  • @bagginsbill Sweet! I'm pretty sure it's possible to turn off shadows on the copy creating the blur.

    ETA: Oh, I see. Ideally there would be a blurred shadow, too. But not having one doesn't bother me.

  • alt text

    There are a few other ways to do this in Poser.
    There not native so to speak, but you can pull it off.

    Let me explain how to do it two ways, and give you a file as an example of one of them.
    Download and save this image somewhere, Poser will ask you for this file when you load the scene.

    alt text

    Here is an example scene, there are a few ways to do the floor.
    The image with the Tesla appears to have a plane for the ground.
    Depending on how you want the road to look, depends on how you approach that.
    Rename it, drop the txt part. The box in the scene, is the stand in for the car.
    Add your car, and put it where the box is, scale it to match the image, etc.
    I did not add an environment, add one so the car has something to reflect.

    Each of the figures in this scene are high res squares converted to figures, each with 2 bones.
    Adding 2 bones you to modify the scaling of the new figure.
    You can edit the weight map, and change where the picture is stretched, giving the illusion of the motion blur.
    Obviously you will need whatever picture you want to use, and modify both the scale of the image and the scale map accordingly.
    You could even make a more complex figure that just used one map, and wont have seams to touch up.
    If you make a better figure, there will not be any post work needed with this method

    alt text

    You can do this one with a simple plane, but you have to render it at least twice.
    Take the first render into your graphics program and make a duplicate layer, then removes all but what you want to blur from the Blur layer.
    The use motion blur to make that effect.
    Make new layer from that, and make a trans map for the blur plane.
    Add a plane and position it in the right spot with the blur and tans map.
    Render it again, and mix the final two renders as layers in your paint program.
    Add another layer and add the rear shadow behind the truck.

    Both of these techniques can be used to do a lot different types of blur.

    To get the shadows like BB was talking about, you can a render movie to images, then use each render as a layer in the final image.
    Mix the layers to get the final output. Alternately, you can use a plane the same way you do the second one.