Texturing_new.pdf

ImageModeler ® 4.0 Mini Tutorial

How to apply and edit textures

Introduction

The goal of this tutorial is to introduce one of the main new features of ImageModeler ® 4.0: The

Texturing Editor tool. Lets have a look at different ways of texturing and assigning images to an

object.

Accessing the tutorial data files

To access the data associated with this document, either browse the CD-ROM (compact

installation), go to <applications_path>/REALVIZ/ImageModeler 4.0 (full installation

default directory), or go to the directory where you have installed ImageModeler ® 4.0 (full

installation custom directory) and open the Tutorial/Data directory.

Please note that you have an online version of the ImageModeler ® 4.0 User Guide. You can access

it in the Help menu in ImageModeler ® 4.0.

Step 1 – Loading the sequence

In the first step you will load a sequence into ImageModeler ® .

1. Select File > Open (or press Ctrl+O ) to access the Open dialog.

2. Browse to the Texturing folder in the Data directory and select “Step1_LoadProject.rzi”. This

is a calibrated scene with a mesh of the building.

3. Click Open.

ImageModeler ® 4.0 Mini Tutorial

Step 2 – Extracting the textures

Note : If you want to bypass this step, load Step2_Mesh_Textured.rzi .

Now we will texture the building.

1. As we only have two visible faces, we cannot run the extraction process on the entire mesh.

We will begin by texturing the two front faces.

Select the “Emerald” mesh in the Scene Browser and in the Texturing tab, click on the

Select faces tool, and click on the two front faces to select them:

2. Click on Extract Texture icon (or press the F11 key) and choose the first image

“DSF0001.jpg” to apply a texture on the selected faces:

3. Click the OK button to continue. An extracted texture appears on the mesh.

ImageModeler ® 4.0 Mini Tutorial

You can repeat this operation for the faces located on the right side of the building, but select the

“cote.jpg” image instead of the “DSCF0001.jpg”. You should have the same result as in the image

below:

Step 3 – Assigning a texture to faces

If you turn the object around, you will see that the other side faces are not textured. As there are

no images from which to extract a texture, we must apply the existing textures to the faces.

1. Firstly, select the faces that you want to texture. Select the Select faces tool in the

Modeling tab, and click on the two front faces.

2. Select Material > Assign Texture . A window displays the assigned texture.

ImageModeler ® 4.0 Mini Tutorial

3. Select the name of the appropriate texture and choose Share Texture Image .

4. Click OK .

The texture is now assigned to the selected faces.

Notice the texture is not copied in the Scene Browser but shared with different face groups.

Repeat the operation for the other faces and check the result.

Tip : You can also assign textures by dragging and dropping them from the Scene Browser .

Simply click on the first extracted texture from the Materials folder of the Scene Browser then

drag it to the selected faces:

Note : If you click the Share Texture Image check box to unselect this option, the next drag and

drop actions will take into account the modification.

ImageModeler ® 4.0 Mini Tutorial

Step 4 – Editing the uv map

We can see that second texture is badly placed. We need to edit the uv coordinate to correct its

orientation.

1. Check the Edit Texture Mapping option by right-clicking in the texture name from the

Scene Browser :

Note : If a texture is shared with several face groups, it is displayed in a sub-menu of the

material name. If you click on a mapping group, it automatically highlights the selected group

in the viewport. In our example, you can easily find the appropriate mapping group.

2. A new menu window is displayed, allowing you to correct and adjust the texture UV with

move , rotate , or tile operations. You can change the size of this window and zoom out to fit

the texture entirely.

Note : You can also change the selected facegroup in the Mapping Groups field list. In our

example, the right group is the second in the list.

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