Computer graphics Labs: Blender (1/3) Modelling, transparency and reflection
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1 Computer graphics Labs: Blender (1/3) Modelling, transparency and reflection University of Liège Department of Aerospace and Mechanical engineering Designed with Blender 2.76b
2 Introduction to the interface Default interface The default Blender window is partitioned in several sub-windows: The 3D visualization window. See below for further details. The information window containing the main software s menus. The Timeline window used for managing animations. The Outliner window displaying in a tree fashion all the objects on the scene. Expanding the tree allows to see how the objects are linked with each other, as well as their properties (material, and so on). The properties window further described here below. 3D visualization window The 3D-window allows editing the scene interactively. It is possible to change the default viewpoint of the scene by holding down the mouse central wheel. Combining the mouse wheel with the [Shift] key allows moving the scene. Similarly, combining the mouse wheel with the [Ctrl] key allows zooming. For mouse lacking the central wheel, the following table shows how to bypass the wheel by combining mouse clicks and keyboard shortcuts. Mouses with two buttons Apple mouse with one button LMB LMB LMB (mouse s button) MMB Alt LMB Opt LMB RMB RMB Cmd LMB The keypad holds shortcuts for setting views: key [7] stands for the top view, [1] for the front view, [3] for the profile view. Toggling between perspective view and the orthographic projection is done via the keypad [5]. The keypad [0] enables/disables the camera view. 2
3 Finally, the Quad View mode partitions the visualization window in 4: three sub-windows contain the three main views (front, profile and top) while the last sub-windows contains the camera view. The Quad View mode is enabled by the [ctrl-alt-q] key combination. The cursor of the 3D-window defines where in the scene new objects will be created. This cursor can be moved by clicking left. By default, some elements are already presents in the scene: a cube, a camera representing the rendering point of view, and a light illuminating the scene. Moreover, the 3D-window has: An Object Tools panel on the left (keyboard shortcut [t]). This panel allows applying several transformations (translations, rotations...) to the selected object. A properties panel for editing the properties of the selected object (position...) This panel can be accessed via the + mark on the upper-right side of the window, or via the keyboard shortcut [n]. A header bar (as all Blender s windows) described here below. Header of the 3D-window By default, the header is located at the bottom of the 3D-window. Several functions are available: The mode selector allows defining how the scene will be edited. The two main useful modes are the Object Mode and the Edit Mode. The Object Mode allows modifying the scene globally (objects are seen as non-modifiable blocs). Whereas, the Edit Mode aims to modify a particular object (we want to change the shape of the object). The handling buttons define the behaviour of the grips available on a selected object in the 3D-window. We will mostly use the Translate Manipulator and the Rotation Manipulator. The Translate Manipulator exhibits a reference frame which allows moving the object in a given direction by clicking on the corresponding frame axis. The Rotation Manipulator rotates the object around each axis. 3
4 The properties window Thanks to the properties window it is possible to edit the properties of the selected object as well as the global properties of the scene. The header holds a variable set of buttons from which it is possible to access to different property panels. For instance, by selecting the cube (right click) one can access to the Material button and edit material properties (diffuse colour, transparency, reflection...) This button is disabled when the camera is selected, while the Texture button (which applies a texture to an object) is enabled for both objects. Several global properties exist. Among them, there is the World button which defines the sky colour and the ambient light; and the Render button which setups the render options and launch a rendering. Customizing the interface The interface may be customized by changing the window layouts and sizes, or by adding new windows. Resizing a window is done by a left click on its edge. A right click on a window edge brings up a context menu: o Split Area splits a window into two parts. o Join Area joints two adjacent windows. Moreover, thanks to the leftmost button of the header it is possible to change the type of any window. This button provides an access to the Editor Type menu, from which we can select the window type to display in a given frame. Hence, it is possible to convert any window type into any other. 4
5 Drawing an octopus with the subsurfs method. (From Drawing the body 1. Start by deleting the default cube located at the centre of the 3D-window. o Select the cube with a right click: the contour become orange. o Press the [Delete] key for erasing it and confirm in the shortcut menu by clicking on Delete (or by pressing [Enter] without moving the mouse). 2. Inserting a circle. o Make sure you have selected the top view by pressing the key [7] of the keypad. o Position the cursor on the origin thanks to a left click on it. The cursor s position defines where new objects will be created. o In the Object Tools panel, select Create Circle. You can also use the control search engine integrated in Blender by pressing [space] and then entering the wanted command name. Here, the name circle brings back a list of similar commands. Choose Add circle in order to construct a circle. o A new tab named Add circle then pops up on the left panel of the 3Dwindow. This tab defines the circle s properties (radius, position...) Assign the vertices number to 8 and the radius to
6 3. Extruding the circle. o Check if the Edit Mode is indeed selected (not the Object Mode ). If not, press [Tab] for toggling from one mode to another. o Select the front-view (key [1] of the keypad) and toggle to the orthographic view (keypad [5]). o Make sure that all the circle vertices are selected (key [a]). o Press key [e] for initializing the extrusion *. Then press key [z] for locking the vertical direction of the extrusion. o Move the cursor upwards in order to position the new vertices as shown in figure 1. Left click to confirm the locations of the new vertices. o Perform again an extrusion by repeating the preceding steps in order to obtain a similar shape as the one shown in figure 2. o Keep the last vertices selected and press key [s] for setting the scale of the section. Adjust the section size so to obtain the object sketched in figure 3. o Toggle-back to the perspective view (keypad [5]). * Warning: when extruding, the key [Esc] does not delete duplicated nodes. In case of mistake, it is better to accept the wrong extrusion by a left click and then to undo the last operation with the command [ctrl+z]. Remember to regularly save your work. Save it into a folder with your name (LASTNAME- Firstname). This folder should be located into the folder Infographie on the Desktop. 4. Creating the tentacles o First, disable the Limit selection to visible option. This option allows only the selection of visible nodes. The corresponding button is located in the 3D-window header. If the button is not displayed, press key [z] in order to toggle from the wired viewing mode to the solid viewing mode. o Toggle to the top-view (key [7] of the keypad). o Unselect all the vertices by pressing [a]. o The key [b] defines a selection box. By keeping key [b] pressed and moving the mouse with its left button pressed, select two neighbouring vertices of the larger circle (figure 1 of the next page). As the option Limit selection to visible is disabled (grayed), the vertices located below the visible ones will also be selected. o Extrude these vertices [e] as shown in figure 2. Press the central mouse wheel to release the constraint of perpendicularity. o Repeat this extrusion procedure twice in order to obtain a similar result to figure 3. 6
7 o Proceed the same way for the other seven tentacles. Do not forget to unselect the last vertices generated by an extrusion before selecting new ones for creating a new tentacle. 5. Raising the body o This step aims to raise the octopus body above the plane of reference, while letting the tentacles dangling. This will be done thanks to the Falloff effect. The falloff allows moving rigidly a part of an object while the other vertices of the object will be altered accordingly to their distance of the moved part. o Unselected all vertices [a] and select [b] the vertices of the body (vertices located on and inside the larger circle). o Toggle to the front view [1] and press key [o] for activating the falloff mode. 7
8 o A new icon shows up into the 3D-window header. By clicking on it, a dropdown menu allows selecting the falloff magnitude. Select Sharp Falloff. o Check if the mode translate Manipulator is enabled and click on the vertical blue arrow in order to move the selection upwards while pressing the left mouse button. A circle shows up: it is the influence area of the falloff. While keeping the left button pressed, adjust the circle size with the central wheel so that it encompasses the whole object. Finally, move the selection upwards. o Deactivate the falloff mode [o]. 8
9 6. Drawing the head. o In the profile view [1], select [b] the upper vertices of the body. Afterwards, make several successive vertical extrusions [e][z] and scaling [s] in order to obtain the head profile. o By using again the upper vertices, perform a last extrusion [e] and scale so that these vertices become coincident. o On the left panel of the 3D-window, click on the Remove Doubles button under the title Remove of the Tools tab. This tool will merge the height duplicated vertices at the top of the head. o A new tab shows up in the lower part of the left panel. Set to 0.1 the value of the field Merge Distance and press Enter. The duplicated nodes will be automatically deleted. You can check the number of selected points in the upper information window. 7. Creating the Subdivision Surface. o In the properties window located on the right-hand side of the screen, activate the Modifiers. o Click on Add Modifier and select «Subdivision Surface» at the bottom of the column Generate. o A rounded shape shows up inside the mesh we have just created. It is possible to adjust the Subdivision Surface with the fields: View : number of pre-visualized subdivisions (as seen in the 3D-window). Render : number of subdivisions used for the rendering. More the number of subdivisions increases, better will be the image quality but longer will be the computation time. In our case, an acceptable result will be obtained with View set at 2 and Render set at 3. 9
10 8. Finalizing the all thing. o Quit the Edition mode by pressing the key [Tab]. o If the wiring mode is activated, toggle to the solid mode either by pressing [z] or by selecting the option Solid inside the menu Viewport Shading of the visualizing window header. o The achieved result is not quite realistic, as the octopus surface is uniformly facetted and coloured by Blender. In order to improve the rendering, it is possible to ask Blender to apply a gradient on each facet following the computed colour at the nodes. To do this, click on the button Smooth under Shading in the left panel of the 3D-window (Object Tools). 9. Remedy to frequent problems. o If some connections between the body and the tentacles seem irregular, there was probably some duplicated point during the extrusion. Remedy: Toggle back to the Edition Mode [Tab]. Select all the nodes located on the base of the tentacles [b] and press again the button Rem Double. Validate the number of deleted nodes. o If some tentacles stay open Toggle back to the Edition Mode [Tab]. Select the 4 nodes at the tentacle tip. Press key [f] for creating a facet linking the nodes together. 10
11 o If dark or bright vertical lines show up, there is a problem of normals. To solve this problem, the normals have to be recomputed: Toggle to the Edit Mode with the key [Tab]. Select all the mesh [a]. In the left panel Shading/UVs, click on the button Recalculate under the title Normals. Toggle back to Object Mode [Tab]. 10. Assigning a material. o To assign a material property to an object, click on the button Material of the properties window (right panel). o Click on the button New that shows up below for creating a new material. A set of tabs is then displayed for defining the properties of the new material. o For our material, we will only define a diffuse colour and let the other parameters at their default values. o In the tab Diffuse, click on the white frame (default material colour). A dialog box will open for defining the colour. Setup the values of the R, G, B channels as written in the below right-hand side figure. 11
12 Drawing the eyes 1. The eye will be created as an object independent from the body. If not already done, quit the Edit Mode [Tab] and toggle to the Object Mode. Otherwise, the eyes will be added to the object constituting the body. 2. Creating the starting sphere. o Toggle to the front view [1]. o Move the cursor in an empty area of the 3D-window (left click). o Add a sphere: Object Tools panel Create UVsphere. o In the lower part of the left panel of the 3D-window, set the number of Segments and Rings both to 20. Check the box Align to View. o In order to use the smoothing, click on the button Smooth of the left panel of the 3D-window. 3. Adding materials. o We will add two materials to this sphere. Click on the button Materials of the properties window. o The sphere that we have just created holds no material. The list of materials is therefore empty. Add two Slots to this list thanks to the button Add Material Slot located nearby the list. o Then, select the first created Slot and click on the button New located under the list. This will assign a new material to this Slot. o Define a white diffuse colour for this first material. It will be used for the white part of the eyes. o Repeat the last two steps for the second Slot. However, use a black diffuse colour for this material, which will be used as pupil. 4. Assigning the materials. We will now assign the two materials to two different regions of the sphere in order to create a pupil. o Toggle to the Edit Mode [Tab], three new buttons shows up under the list of materials in the properties window: Assign, Select and Deselect. o Select all the vertices of the sphere (if necessary, use the key [a]) and select in the list the white material. Click on the Assign button. o For defining the pupil, unselect [a] all the vertices. Now, select all the vertices located at the middle of the sphere. 12
13 Use the circular selection tool [c] (if needed, adjust the size of the selection circle with the mouse wheel) and press [Enter] to confirm the selection. o In the list of the properties window, select the black material and click Assign. 5. Shaping the sphere. o Use the profile view [3], reselect all the vertices [a][a], and apply a shear [ctrlalt-shift-s] in order to flatten the eye. Repeat the process several times if needed. End with a rotation [r] in order to align the eye with the vertical plane. Shear Rotation o Inside the front view, carry out a scaling following z axis [s][z] to round the pupil. 6. Positioning and creating a copy. o Quit the edit mode [Tab] and position the eye on the octopus by using [g] for moving it and [r] for rotating it. Do not hesitate to change the view or to use the Quad View [ctrl-alt-q]. A scaling should probably be required [s]. o Once the eye positioned, copy it [shift-d] and position the copy. 13
14 Finalizing the octopus 1. Adjusting the camera s location. o The camera s location should be adjusted to the scene we have just created. For more ease, activate the Quad View mode [ctrl-alt-q]. o In the top right view, the camera field of view is given by the orange frame. Use the three other visualization windows for adjusting the camera s position in order to encompass the octopus in the field of view. o Once the camera positioned, press key [F12] for computing a rendering of the scene. The computed image replaces the 3D-window. To go back to the 3D-window, press [Esc]. 14
15 2. Changing the illumination. o As is, the scene is probably not properly illuminated. Firstly, we will change the light source type. o Select the light and click on the button Object Data in the header of the properties window. o Change the source type from Point to Sun (inside the object lamp ) in order to obtain a more suited illumination for the remainder of this tutorial. Indeed, the source type Sun illuminates the scene uniformly with parallel rays, while the source type Point has a limited illumination range and its rays are not parallel. o After the modification of the source type, the symbol figuring the light source is changed. A discontinuous line originating from the light source indicates the rays direction. Change this direction in order to properly illuminate the object. If needed, change the value of the field Energy inside the tab Lamp if the scene is too dark. Creating the ground 1. Adding a plane. o Set the cursor below the octopus and then select the top view [7]. Next, add a plane: Object Tools panel Create Plane. o Scale the plane [s] so it covers the whole camera field. 2. Applying a texture. o For obtaining a more realistic ground, we will use a texture. Firstly, create a material. In the properties window, click on the button Material and then on the button New. o For creating a texture, click on the button Texture located on the righthand site of the button Material, in the header of the properties window. o Click on New and select Stucci inside the menu Type which appears immediately below. o Next, go to the tab Colors and check the box Ramp for applying a gradient to the texture. o A gradient is defined by a sequence of colours that Blender will interpolate. It is possible to change each colour of the sequence individually by selecting it thanks to its index. The default gradient holds two colours of index 0 and index 1 respectively. For changing a colour, click on its preview. 15
16 Edited colour index Colour preview o Define the colour of index 0 to R=1, G=0.85, B=0.5 and A=1. o Define the colour of index 1 to R=0.65, G=0.6, B=0.35 and A=1. o Go to the tab Mapping, located lower in the properties window. This tab defines how the texture should be applied to the plane. To ensure the texture seems small enough, an increase of the scale of the texture space is necessary. Change the values of X, Y, and Z under the title Size to 8. o The ground is now finished, you can compute a rendering [F12] for obtaining the final result. 16
17 Creating the water surface 1. Adding the water surface. o We consider that the camera lies above the water surface and that the octopus lies below it. The light rays coming from the octopus will pass through two different materials (the water and air) before reaching the camera. As a consequence, the ray trajectory will not be straight anymore (refraction effect). Thus, the perceived image by the camera will be modified. o As Blender can process only surfaces, the refraction effect will be modelised at the water surface. Set the cursor above the octopus but below the camera (raise the camera upwards if necessary) in order to define where the water surface will be created. Next, using the top view [7], add a plane (Object tools panel Create Plane). o Scale the plane so it is as big as the ground [s]. Then, use translations and rotations so that the plane covers half of the camera field (use the Quad View mode for this). Covering the half of the camera field will help us to assess the effects of refraction. 2. Applying material properties to the water surface. o Quit the Edit Mode [Tab] if it is enabled. o Click on the button Material in the header of the properties window. Add a new material to the plane by clicking on New. o Define a diffuse colour for the water, as described in the figure below. 17
18 o The tab Transparency enables the calculation of transparency and defines the refractive properties of the material. Transparency is enabled by checking the box located on the left of the title Transparency. Enable the transparency calculation by raytracing computation by clicking on the button Raytrace. Next, define the transparency level by setting the parameter Alpha to 0.2 and the refraction value index IOR to 1.33 (which is the IOR of the water). o If you try to render the scene now, you will notice that the shadowed parts of the image are totally black. Actually, the materials used for the octopus need to be configured so they can handle transparent shadows. To configure the materials, select each object and, in the Material properties, check the box Receive transparent in the tag Shadow (located below the material properties). This process needs to be repeated for the two materials applied on the eyes. Note that this configuration change is only needed for one eye, as the two eyes share the same material properties. o The scene rendering can now be computed in order to check the effects of the added surface. 18
19 3. Adding a wave effect to the surface o From a realistic point of view, a water surface is seldom perfectly flat and smooth. Therefore, the image we have just obtained seems unnatural. Fortunately, Blender offers a quite easy way for introducing image deformations caused by waves on the water surface. o Select the plane that models the water surface and, as for the ground, add a texture to it. In the header of the properties window, click on the button Texture and then New. Select again a new type of texture Stuccy. o In the tag Mapping of the Texture properties, use the value 10 for the X, Y and Z parameters under the title Size, in order to get waves close enough to each other. o Go to the tag Influence of Texture properties. This step is the most important for obtaining a convincing wave effect. This tag defines the influence that the texture will have on the object. Unselect the option Color (the texture will not affect the object s colour). Check the box Normal so that the texture will affect the normal. The normal vector to the surface is used by the ray-tracer for computing the refraction. Change the field value of the Normal to This value defines how much the normal is changed by the texture (i.e. it defines the wave amplitude). o Compute the rendering. Note: If the wave effect does not seem to appear, select the Edit Mode [Tab] and, then press the key [u]. In the appearing menu, click Unwrap. Compute the rendering again. 19
20 o If needed, adjust the field values of parameters X, Y and Z of the tag Mapping as well as the field value of the parameter Normal. Indeed, these values depend on the size of the water surface. 4. Reflection on the water surface. o As it is, the water seems to be too transparent. As a matter of fact, the water surface reflects an image of its surrounding environment. o Reflection can be defined into the tag Mirror, in the section Material of the properties window. Begin by enabling the effect by checking the upper box of the tag. Next, as shown in the figure below, define the values of Reflectivity (intensity of the reflection) and Fresnel which influences how the reflection evolves with the incidence angle. 5. Changing the sky o The default sky of Blender is gray and uniform. We will replace it by using a texture which will generate a partially cloudy sky. o Click on the button Texture in the header of the properties window. Next, click on the button Show World Texture at the top of the Texture section. 20
21 o Then, click on the button New for adding a texture. Select Clouds as type and adjust the gradient colours in the tag Colors as following (enable the option Ramp ). Define the colour of index 0 to R=0.3, G=0.6, B=0.9 and A=1. Define the colour of index 1 to R=1.0, G=1.0, B=1.0 and A=1. o Finally, in the tag Influence, check the box Horizon in order to apply the texture to the sky. o The last remaining step consists in adjusting the camera position and the sizes of the ground plane and water surface plane in order to obtain the final scene. 21
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