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>> I'm going to show you how to put a 3D object

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into your video using the camera[br]tracking features in Blender.

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And if you want to follow along with me[br]in this tutorial, click the link below

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to download this exact video clip.

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So open up Blender and go into the[br]motion tracking tab by clicking here.

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Then here.

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You can either drag your footage in here,

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but I'm going to click open[br]and select our video clip.

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The first thing I'm going to do is[br]click on set scene frames so that in

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and out points matches the[br]length of the video clip.

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Then click on prefetch to[br]load the clip into memory.

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Then under tracking settings,[br]I'm going to set the motion model

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to affine and the match to previous frame.

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Affine takes into account the[br]perspective changes in the shot.

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And previous frame basically just tracks the[br]pattern from the current frame to the next one.

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Then I'm going to tick normalize.

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This makes sure that if there's[br]any changes in light

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in the video clip, the track[br]is not affected by it.

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Now that's done, I'm going to go to the[br]first frame by pressing shift arrow,

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and then click on detect features.

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Now these boxes on the scene[br]are tracking markers.

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They track points of contrast within the clip.

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Now I want more tracking markers, so I'm going[br]to click on this little tab on the bottom left.

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I'm going to change the threshold to 0.1.

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I'm going to change the distance to, say, 50.

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And I'm going to set the margin[br]from the edge of the frame,

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or the borders of the frame, to about 50 pixels.

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Now if you go into our tracking setting[br]over here, we need to set the value

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of this margin lower than the[br]value of the other margin.

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So I'm going to set this to about 40.

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Now, with all the markers selected, I[br]want to press control T to track forwards.

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Yeah, brilliant.

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Once you've finished tracking forwards,[br]making sure all the markers are highlighted.

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And if you want to highlight all the[br]markers, just hover your mouse over here

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and press A. Now I'm going[br]to press H to hide them all.

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And while still being on the last frame, I'm[br]going to once again click on detect features

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to bring up all the tracking points.

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And I'm fully happy with these tracking[br]markers so I'm going to track backwards

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by pressing shift control[br]T, or control shift T. Nice.

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Next, I want to reveal all the trackers,

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so I'm going to press alt H[br]to bring up all the trackers.

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Now we have a couple of trackers[br]that are problematic.

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For instance, maybe these ones[br]here that follow the cars.

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So what I'm going to do, you[br]can either delete them manually

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by selecting them and pressing X to delete.

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Or you can also click on solve right here.

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Then select cleanup to get rid of any glitchy[br]tracks or tracks that have high error value.

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I'm going to click on filter tracks.

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And, as you can see, it's selected[br]all the markers that are glitchy.

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So all I have to do is hold my mouse[br]over the footage, press X and delete.

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I'm going to go halfway throughout[br]the clip and select filter tracks.

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And there's none.

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And just to make sure, I'm going to go to[br]the last frame and select filter tracks.

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And there's none showing up, so that's good.

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Okay, so next, while still on the solve tab, I'm[br]going to select focal length and optical center.

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Then for keyframe A and B, so you want to pick[br]a frame range where the camera is moving a lot

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so Blender can actually track the shot.

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So I'm going to pick a frame range[br]between 100 to, say, frame 180.

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I've just seen some tracks that are[br]wild, so I'm going to delete them now.

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Like so. Get rid of this.

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Get rid of that one.

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Yeah, that's cool.

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That's fine.

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Now I'm going to click on solve camera motion.

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And we have a solve error[br]of 0.35 which is fantastic.

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Any solve error below a pixel is good.

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And anything below 0.5 is great.

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Any solve error above one pixel is[br]not a good track, I wouldn't use it.

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Now in the scene setup, on the[br]left, click on set as background.

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And, as you can see, it puts the[br]video in the background of the camera.

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Then I'm going to select setup tracking scene.

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Next, I'm going to hold shift[br]and select these three tracks,

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and click on floor to set the floor plane.

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Now I'm going to set the origin of my scene by[br]clicking this track and selecting set origin.

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Just to make sure that's the middle of[br]my scene, I'm going to delete this cube

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and I'm going to go into the layout view.

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So I'm going to click this tab.

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Then I'm going to press zero on my[br]numpad to look through the camera.

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And I'm going to click this little scroll down[br]button here and I'm going to select 3D cursor.

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Once I've selected 3D cursor, I'm going[br]to make sure my camera is highlighted.

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And I'm going to place R for rotation and I'm[br]just going to line up the camera's perspective

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so that the Y direction is going[br]along the road and the X is going

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across the road, just like that, in this field.

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Just so it lines up like that.

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That's perfect.

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I'm going to select the scroll down button[br]again and select bounding box center.

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Next, I'm going to change the scale.

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And I'm going to move the plane about here.

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Yeah, that's nice.

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That's perfect.

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I'm happy with that.

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Now I'm going to press space bar just to make[br]sure that the plane is sticking to the ground.

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Yeah, that looks good.

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Now we can easily put a 3D[br]object into the scene.

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I'm going to press shift A,[br]mesh, and select the monkey.

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I'm going to place the monkey so[br]that it's kind of facing the camera.

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Also so that it's just sitting above the plane.

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Yeah, that's good.

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I'm going to decrease the scale a bit.

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Yeah, perfect.

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Now I'm going to go into render view by[br]either pressing Z then clicking render.

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Now, as you can see, we can't[br]really see the video footage.

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But to show the video clip, click[br]on the render properties tab,

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go to film, then select transparent.

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And we can now view the clip through the camera.

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Now, as you can see, we don't[br]have any shadows cast.

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That's because we need to bring the ground plane

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from the ground collection[br]into the foreground collection.

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So I'm going to do that.

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I'm going to change the light to a[br]sunlight by clicking on this light.

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And clicking on the light[br]properties and selecting sun.

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I'm going to decrease the[br]power to about three or five.

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And I'm going to change the angle to match[br]where the sun is coming from in our clip.

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And I'm going to change the angle[br]so that the shadows aren't so harsh.

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Nice. Perfect.

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Now there's a lot of other things you can do[br]to increase the realism of this object fitting

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in this clip, like adding realistic reflections,[br]lighting with a HDRI, adding blur and glare.

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But I'll cover that in another tutorial.

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There's also several other ways you[br]can track a more difficult shot,

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and I'll also cover that in another tutorial.

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But, for now, I hope you learned something[br]new and any questions let me know.

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And I'll see you in the next one.

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Take care.

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Cheers.

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