Maya Camera Projection

7/27/2019 Maya Camera Projection

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Matte Painting by Wendy Park.We will start with a quick look at the image we will be using to project thru a camera onto geometry.

< The flattened matte painting on the left.

Painted by Wendy Park.

You can see more of her work at:

www.wendypark.com

thank you Wendy !

The Original image was 5970 x 2274

pixels.The image has an aspect ratio of

2.62:1.

The Matte Painting was handed off in

layers so this makes things much easier

to separate.

Below are the individual layers w e will

use with their mattes.

Tree in foreground with matte.

I will name these

"otis_cam_proj_mp_layr_01_C.tga" and

"otis_cam_proj_mp_layr_01_M.tga"

respectively.

"_C" for color and a separate file "_M" for

the matte fromthis point on.

Bush in lower right corner with

matte.

otis_cam_proj_mp_layr_02_C.tga

otis_cam_proj_mp_layr_02_M.tga

Midground hill and tree with matte.



Midground tree center with matte.



Background trees A with matte.



Background trees B with matte.



Hill midground right with matte.

otis_cam_proj_mp_layr_07_C.tgaotis_cam_proj_mp_layr_07_M.tga

Mountains in background with

matte.



Small mountains with matte.



Water layer corner with matte.



< This is the last element in the Photoshop

file and our background.Sky background.

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We will not need a matte element for this._ _ _ _ _ _ .

Launch Maya: Create a camera and name it "Proj_Cam" in the

outliner.

We don't have to worry about matching the perspective since this is

a matte painting.

We can leave it at it's origin (0,0,0 for translate rotate and scale). I

would recommend

locking the translate, rotate and scale so your projection camera does

not move once you start.

Step_01

Select the "Proj_Cam" and open the camera attribute editor.

The original image was 5970 x 2274 giving us an aspect ratio of 2.63

to 1. (5970 /2274)

The default focal length of 35mmw ill work fine.

We do need to set the FilmAspect Ratio to 2.62 to project our image

without distorting it.

Step_02

Set Fit Resolution Gate to "Overscan".

You will be able to view the entire image when it loads.

Step_03

Scroll down to the Environment tab,

select Create next to Image Plane.

Step_04

Select your image plane and adjust the alpha gain

so you can see the grid and geometry in the background.

Step_05Set Fit to Fill and fit to filmgate.

Model ing / Geometry Notes:

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Create geometry to match the image in the Projection camreras view.

The geometry should be low poly and as simple as possible. By

painting,

cloning etc, create the image maps for you are set. Foreground, mid-

ground,

background and any specific maps you may need for your particular

scene.

Have these ready for the shader / projection process.

Step_06

In the front view I created a poly plane with 30 subdivisions in H and

W.

This will line up with the first tree in the FG on the left side of the

screen.

I will name this "plane_01"

(..._01 matches the texture name "otis_cam_proj_mp_layr_01_C.jpg")

.

Step_07

In the Hypershade create a Lambert shader.

Select the "plane_01" geo.

Assign this new material to this selection and name the shader

plane_01_shader.

Back to the plane_01_shader in the in the hypershade, select the

out color in the surface shader attributes.

Step_08

Make sure as projection is selected, then select file.



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Step_13

Just as before set:

Projection type to Perspective.

Link to camera to our Proj_Cam.

Match camera filmgate.

Select the triangle in the circled are to navigate to the matte image we

will load into the shader node.

Step_14

Navigate to the "otis_cam_proj_mp_layr_01_M.tga" image and add it

to the transparency channel in the shader node.

Step_15

The shader should look like this in the Hypershade.

Now apply this shader to the geometry you created for the

tree in the forground "plane_01".

Step_16

I moved the image back -95 units in Z.

We will build the rest of the scene back fromthis point.



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Step_17

I will make a new layer for the bush in the lower right

corner and set it back in -100 units in Z.

Then repeat steps 7 thru 14 for this.

Step 18After I applied the shaders to the first two geometry

elements, I did a test render. The colors were very dark

and on a black background, so I couldn't really see

anything until I checked the alpha channel.

Layer 3 is the next layer.

It shows a tree on a small hill sloping down to the river

bank.

I will build the geometry f or this then translate it back -135

units in Z behing the previous 2 geometry elements.

Next repeat steps 7 thru 14 to create the shader.

In the perspective w indow I enabled "High Quality

Rendering". This way we can see the environment

develop while we build it.



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Step 19

Go to: Show / Isolate Selected / View Selected.

As shown on the image on the left.

Now right click on the geometry and go to" Paint / Sculpt.

Step 20

This should activate the "Sculpt Geometry Tool" options.

So they don't look completly flat, we will now add some

depth to the hill and tree in the image.

Using the "Push", "Pull", "Smooth", "Relax" and "Erase"

tools I w ill add some depth to the geometry.

Using the "Sculpt Geometry Tool".



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Using the "Sculpt Geometry Tool".

After I amdone sculpting the geometry,

I will remove soome of the faces that are not needed.

Using the "Sculpt Geometry Tool" on "Plane_01".

I will do the same for "Plane_02".

otis_cam_proj_mp_layr_04_C.tga and it's geometry have

been added.



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Plane_04 has been sculpted slightly.

Plane_04 shown in contex with scene.

Plane_05 added with shader and sculpted in open GL.

Plane_06 added with shader in open GL.



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Note the slight angle of the sculpted plane.

A screenshot of the environment to this point.


Plane_09 added behind mountains.



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Plane_10 will be the water layer.

Perpendicular to the trees, mountains, etc.

Add the plane_10 shader.

Translate it down to the water level in the scene.

There we go.

only one more layer to add.



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Copyright 2010 Raul Moreno. All rights reserved | Back to Top

The sky has been added behind the mountains.

At this point the Camera Projection is done.

It will be necessary to create another camera with a similar focal length and filmback as the projection camera.

The start position of the "Record" camera will need to be in close proximity to the "Projection" camera, or you will

see the images stretch horribly. So, yes the camera movement will be somewhat limited. You can always add more

"Projection" cameras w ith more povs, allowing you more f lexibility w ith your camera.

Have fun!

This is a very nice camera projection example done by Brian Cuartero. QT
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Maya Camera Projection

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